早教吧作业答案频道 -->数学-->
计算下面各题，能简算要简算．（1）65×67-67÷5（2）99+99×0.9+99×8.1（3）813÷7+17×513（4）116×4÷14×4．
题目详情
计算下面各题，能简算要简算．
（1）
×
-
÷5
（2）99+99×0.9+99×8.1
（3）
÷7+
×
（4）
×4÷
×4．计算下面各题，能简算要简算．
（1）
×
-
÷5
（2）99+99×0.9+99×8.1
（3）
÷7+
×
（4）
×4÷
×4．
×
-
÷5
（2）99+99×0.9+99×8.1
（3）
÷7+
×
（4）
×4÷
×4．
6 5 6 6 5 5
-
÷5
（2）99+99×0.9+99×8.1
（3）
÷7+
×
（4）
×4÷
×4．
6 7 6 6 7 7
÷5
（2）99+99×0.9+99×8.1
（3）
÷7+
×
（4）
×4÷
×4．
6 7 6 6 7 7
÷7+
×
（4）
×4÷
×4．
8 13 8 8 13 13
×
（4）
×4÷
×4．
1 7 1 1 7 7
（4）
×4÷
×4．
5 13 5 5 13 13
×4÷
×4．
1 16 1 1 16 16
×4．
1 4 1 1 4 4
（1）
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
（1）
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
| 6 |
| 7 |
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
| 6 |
| 7 |
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
| 1 |
| 7 |
| 5 |
| 13 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
| 5 |
| 13 |
| 1 |
| 16 |
| 1 |
| 4 |
| 1 |
| 16 |
| 1 |
| 4 |
| 1 |
| 4 |
▼优质解答
答案和解析
（1）
×
-
÷5
=
×
-
×
=（
-
）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 5 6 6 65 5 5×
-
÷5
=
×
-
×
=（
-
）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 7 6 6 67 7 7-
÷5
=
×
-
×
=（
-
）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 7 6 6 67 7 7÷5
=
×
-
×
=（
-
）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 5 6 6 65 5 5×
-
×
=（
-
）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 7 6 6 67 7 7-
×
=（
-
）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 7 6 6 67 7 7×
=（
-
）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
1 5 1 1 15 5 5
=（
-
）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 5 6 6 65 5 5-
）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
1 5 1 1 15 5 5）×
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 7 6 6 67 7 7
=1×
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 7 6 6 67 7 7
=
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
6 7 6 6 67 7 7
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
8 13 8 8 813 13 13÷7+
×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
1 7 1 1 17 7 7×
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
5 13 5 5 513 13 13
=
×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
8 13 8 8 813 13 13×
+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
1 7 1 1 17 7 7+
×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
1 7 1 1 17 7 7×
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
5 13 5 5 513 13 13
=（
+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
8 13 8 8 813 13 13+
）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
5 13 5 5 513 13 13）×
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
1 7 1 1 17 7 7
=1×
=
（4）
×4÷
×4
=
×4×4×4
=4
1 7 1 1 17 7 7
=
（4）
×4÷
×4
=
×4×4×4
=4
1 7 1 1 17 7 7
（4）
×4÷
×4
=
×4×4×4
=4
1 16 1 1 116 16 16×4÷
×4
=
×4×4×4
=4
1 4 1 1 14 4 4×4
=
×4×4×4
=4
1 16 1 1 116 16 16×4×4×4
=4
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
=
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 5 |
=（
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
=
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 5 |
=（
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 7 |
| 6 |
| 7 |
=
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 5 |
=（
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 7 |
=
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 5 |
=（
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 5 |
=（
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 5 |
=（
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 7 |
| 1 |
| 5 |
=（
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 5 |
=（
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 7 |
=
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 6 |
| 7 |
（2）99+99×0.9+99×8.1
=99×（1+0.9+8.1）
=99×10
=990
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 7 |
（4）
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 4 |
=
| 1 |
| 16 |
=4
| 1 |
| 16 |
=4
看了 计算下面各题，能简算要简算．...的网友还看了以下：
根据54×39=2106，直接在括号内填上合适的数．5.4×39=54×3.9=5.4×3.9=5 2020-04-07 …
运用简便方法计算．17.38-（3.38+2.49）4.52-0.87-7.1324×（1012+ 2020-04-07 …
学而思初一暑期有理数的混合运算.一.（1）-5又17/37-[(-9.5)+4又3/74]+7.5 2020-04-26 …
-9.-5.-4.-1.0.1.4.5.9分别填入九字格使横竖斜和都相等急! 2020-06-06 …
2△3=2+3+4=9,5△4=5+6+7+8=26.求9△5=?21△4=?2△3=2+3+4= 2020-07-17 …
0.56×2.02=4.6×1.9+5.4×1.9=6.5×12.8-6.5×2.8=1.25×0 2020-07-17 …
1、3.64+2.45－2.78+0.36―1.45+3.783、1.2+1.3+1.4+…+9. 2020-07-19 …
这种九宫格怎么填,8**9**6**\x05\x05*6**7**8*\x05**2**8**41* 2020-10-31 …
9乘9宫81宫数字游戏规则:在空白格内填入1~9使得每行,每列和每宫格内的数字都是1~9不能重复.┃ 2020-11-01 …
飞机场上原来有9架飞机,又降落了4架,飞机场上现在有多少架飞机?正确的解答是A.9+4=13(架)B 2020-12-13 …