下面各题怎么简便怎么算.89×(716-14)÷12;78÷[32×(1-58)+144];715×45-215×45;0.32×2.5×0.125.-数学

题目简介

下面各题怎么简便怎么算.89×(716-14)÷12;78÷[32×(1-58)+144];715×45-215×45;0.32×2.5×0.125.-数学

题目详情

下面各题怎么简便怎么算.
8
9
×(
7
16
-
1
4
)÷
1
2

78÷[32×(1-
5
8
)+144];
7
15
×
4
5
-
2
15
×
4
5

0.32×2.5×0.125.
题型:解答题难度:中档来源:不详

答案

(1)class="stub"8
9
×(class="stub"7
16
-class="stub"1
4
)÷class="stub"1
2

=class="stub"8
9
×class="stub"3
16
×2,
=class="stub"1
3


(2)78÷[32×(1-class="stub"5
8
)+144]
=78÷[32×class="stub"3
8
+144],
=78÷[12+144],
=78÷156,
=0.5;

(3)class="stub"7
15
×class="stub"4
5
-class="stub"2
15
×class="stub"4
5

=(class="stub"7
15
-class="stub"2
15
)×class="stub"4
5

=class="stub"1
3
×class="stub"4
5

=class="stub"4
15


(4)0.32×2.5×0.125
=0.4×0.8×2.5×0.125,
=(0.4×2.5)×(0.8×0.125),
=1×0.1,
=0.1.

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