题目内容
(2009?翠屏区)简便计算.
976-387-213
1.25×3.75×0.8
(
+
-
)÷
.
976-387-213
1.25×3.75×0.8
(
2 |
5 |
1 |
6 |
4 |
15 |
1 |
30 |
分析:(1)运用减法的性质简算;
(2)运用乘法交换律与结合律简算;
(3)把除法转化为乘法,运用乘法分配律简算.
(2)运用乘法交换律与结合律简算;
(3)把除法转化为乘法,运用乘法分配律简算.
解答:解:(1)976-387-213,
=976-(387+213),
=976-600,
=376;
(2)1.25×3.75×0.8,
=(1.25×0.8)×3.75,
=1×3.75,
=3.75;
(3)(
+
-
)÷
,
=(
+
-
)×30,
=
×30+
×30-
×30,
=12+5-8,
=9.
=976-(387+213),
=976-600,
=376;
(2)1.25×3.75×0.8,
=(1.25×0.8)×3.75,
=1×3.75,
=3.75;
(3)(
2 |
5 |
1 |
6 |
4 |
15 |
1 |
30 |
=(
2 |
5 |
1 |
6 |
4 |
15 |
=
2 |
5 |
1 |
6 |
4 |
15 |
=12+5-8,
=9.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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