题目内容
能简算的要简算
32×0.375+
÷
(
+
)×
90.5×99+90.5.
32×0.375+
5 |
8 |
1 |
32 |
(
1 |
2 |
1 |
3 |
24 |
35 |
90.5×99+90.5.
分析:(1)先把除法变成乘法,再运用乘法分配律简算;
(2)先算小括号里面的加法,再算括号外的乘法;
(3)运用乘法分配律简算.
(2)先算小括号里面的加法,再算括号外的乘法;
(3)运用乘法分配律简算.
解答:解:(1)32×0.375+
÷
,
=32×0.375+0.625×32,
=(0.375+0.625)×32,
=1×32,
=32;
(2)(
+
)×
,
=
×
,
=
;
(3)90.5×99+90.5,
=90.5×(99+1),
=90.5×100,
=9050.
5 |
8 |
1 |
32 |
=32×0.375+0.625×32,
=(0.375+0.625)×32,
=1×32,
=32;
(2)(
1 |
2 |
1 |
3 |
24 |
35 |
=
5 |
6 |
24 |
35 |
=
4 |
7 |
(3)90.5×99+90.5,
=90.5×(99+1),
=90.5×100,
=9050.
点评:乘法分配律是常用的简便运算的方法,要熟练掌握,灵活运用.
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