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用简便方法计算.(写出简算过程)(1)99×101(2)12×(14+16-13)(3)1316×511+516×311.
题目详情
用简便方法计算.(写出简算过程) (1)99×101 | (2)12×(
| (3)
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(1)99×101
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(1)99×101
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▼优质解答
答案和解析
(1)99×101
=99×(100+1)
=99×100+99×1
=9900+99
=9999;
(2)12×(
+
-
)
=12×
+12×
-12×
=3+2-4
=1;
(3)
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
1 1 14 4 4+
-
)
=12×
+12×
-12×
=3+2-4
=1;
(3)
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
1 1 16 6 6-
)
=12×
+12×
-12×
=3+2-4
=1;
(3)
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
1 1 13 3 3)
=12×
+12×
-12×
=3+2-4
=1;
(3)
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
1 1 14 4 4+12×
-12×
=3+2-4
=1;
(3)
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
1 1 16 6 6-12×
=3+2-4
=1;
(3)
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
1 1 13 3 3
=3+2-4
=1;
(3)
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
13 13 1316 16 16×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
5 5 511 11 11+
×
=
×
+
×
=
×(
+
)
=
×
=
.
5 5 516 16 16×
=
×
+
×
=
×(
+
)
=
×
=
.
3 3 311 11 11
=
×
+
×
=
×(
+
)
=
×
=
.
5 5 516 16 16×
+
×
=
×(
+
)
=
×
=
.
13 13 1311 11 11+
×
=
×(
+
)
=
×
=
.
5 5 516 16 16×
=
×(
+
)
=
×
=
.
3 3 311 11 11
=
×(
+
)
=
×
=
.
5 5 516 16 16×(
+
)
=
×
=
.
13 13 1311 11 11+
)
=
×
=
.
3 3 311 11 11)
=
×
=
.
5 5 516 16 16×
=
.
16 16 1611 11 11
=
.
5 5 511 11 11.
=99×(100+1)
=99×100+99×1
=9900+99
=9999;
(2)12×(
1 |
4 |
1 |
6 |
1 |
3 |
=12×
1 |
4 |
1 |
6 |
1 |
3 |
=3+2-4
=1;
(3)
13 |
16 |
5 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
3 |
11 |
=
5 |
16 |
16 |
11 |
=
5 |
11 |
1 |
4 |
1 |
6 |
1 |
3 |
=12×
1 |
4 |
1 |
6 |
1 |
3 |
=3+2-4
=1;
(3)
13 |
16 |
5 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
3 |
11 |
=
5 |
16 |
16 |
11 |
=
5 |
11 |
1 |
6 |
1 |
3 |
=12×
1 |
4 |
1 |
6 |
1 |
3 |
=3+2-4
=1;
(3)
13 |
16 |
5 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
3 |
11 |
=
5 |
16 |
16 |
11 |
=
5 |
11 |
1 |
3 |
=12×
1 |
4 |
1 |
6 |
1 |
3 |
=3+2-4
=1;
(3)
13 |
16 |
5 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
3 |
11 |
=
5 |
16 |
16 |
11 |
=
5 |
11 |
1 |
4 |
1 |
6 |
1 |
3 |
=3+2-4
=1;
(3)
13 |
16 |
5 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
3 |
11 |
=
5 |
16 |
16 |
11 |
=
5 |
11 |
1 |
6 |
1 |
3 |
=3+2-4
=1;
(3)
13 |
16 |
5 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
5 |
16 |
3 |
11 |
=
5 |
16 |
13 |
11 |
3 |
11 |
=
5 |
16 |
16 |
11 |
=
5 |
11 |
1 |
3 |
=3+2-4
=1;
(3)
13 |
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5 |
11 |
5 |
16 |
3 |
11 |
=
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