早教吧 育儿知识 作业答案 考试题库 百科 知识分享

能简算的要简算①7.6×0.45+6.5×0.76-735×0.1②217×215+217③19941995×1995④45×37÷45×37⑤12+16+112+120+130.

题目详情
能简算的要简算
①7.6×0.45+6.5×0.76-7
3
5
×0.1
2
17
×
2
15
+
2
17

1994
1995
×1995
4
5
×
3
7
÷
4
5
×
3
7

1
2
+
1
6
+
1
12
+
1
20
+
1
30
▼优质解答
答案和解析
①7.6×0.45+6.5×0.76-7
3
5
×0.1,
=7.6×0.45+0.65×7.6-7.6×0.1,
=7.6×(0.45+0.65-0.1),
=7.6×1,
=7.6;

2
17
×
2
15
+
2
17

=
2
17
×(
2
15
+1),
=
2
17
×
17
15

=
2
15


1994
1995
×1995=1994;

4
5
×
3
7
÷
4
5
×
3
7

=(
4
5
×
5
4
)×(
3
7
×
3
7
),
=1×
9
49

=
9
49


1
2
+
1
6
+
1
12
+
1
20
+
1
30

=(1-
1
2
)+(
1
2
-
1
3
)+(
1
3
-
1
4
)+(
1
4
-