题目内容
(2013?岚山区模拟)递等式计算(能简算的要简算)
83052÷27+924
2.25×
+1.75×
+0.6
×9.6-3.8
12×(
+
-
)
83052÷27+924
2.25×
3 |
5 |
3 |
5 |
7 |
12 |
12×(
1 |
4 |
1 |
6 |
1 |
3 |
分析:(1)先算除法,再算加法;(2)运用乘法分配律简算;(3)先算乘法,再算减法;(4)运用乘法分配律简算.
解答:解:(1)83052÷27+924,
=3076+924,
=4000;
(2)2.25×
+1.75×
+0.6,
=2.25×0.6+1.75×0.6+0.6,
=(2.25+1.75+1)×0.6,
=5×0.6,
=3;
(3)
×9.6-3.8,
=5.6-3.8,
=1.8;
(4)12×(
+
-
),
=12×
+12×
-12×
,
=3+2-4,
=1.
=3076+924,
=4000;
(2)2.25×
3 |
5 |
3 |
5 |
=2.25×0.6+1.75×0.6+0.6,
=(2.25+1.75+1)×0.6,
=5×0.6,
=3;
(3)
7 |
12 |
=5.6-3.8,
=1.8;
(4)12×(
1 |
4 |
1 |
6 |
1 |
3 |
=12×
1 |
4 |
1 |
6 |
1 |
3 |
=3+2-4,
=1.
点评:乘法分配律是最常用的简便运算的方法,要熟练掌握,灵活运用.
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