题目内容
用简便方法计算.
6.3×8.7+8.7×3.7 | (
|
|
分析:这三道题使用乘法分配律能使计算简便,由此解答即可.
解答:解:①6.3×8.7+8.7×3.7
=(6.3+3.7)×8.7
=10×8.7
=87;
②(
-
+
)×12
=
×12-
×12+
×12
=4-2+3
=5;
③
×
+
÷
.
=
×
+
×
=(
+
)×
=2×
=1
.
=(6.3+3.7)×8.7
=10×8.7
=87;
②(
1 |
3 |
1 |
6 |
1 |
4 |
=
1 |
3 |
1 |
6 |
1 |
4 |
=4-2+3
=5;
③
7 |
4 |
5 |
8 |
1 |
4 |
8 |
5 |
=
7 |
4 |
5 |
8 |
1 |
4 |
5 |
8 |
=(
7 |
4 |
1 |
4 |
5 |
8 |
=2×
5 |
8 |
=1
1 |
4 |
点评:此题主要考查运算定律的运用.
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