脱式计算,能简算的要简算.25×3.2×125125×99+1258183×8247×20+8÷745×(13-15)÷512415×8×217.-数学

题目简介

脱式计算,能简算的要简算.25×3.2×125125×99+1258183×8247×20+8÷745×(13-15)÷512415×8×217.-数学

题目详情

脱式计算,能简算的要简算.
25×3.2×125
1
25
×99+
1
25
81
83
×82
4
7
×20+8÷
7
4
5×(
1
3
-
1
5
)÷
5
12
4
1
5
×8×2
1
7
题型:解答题难度:中档来源:不详

答案

(1)25×3.2×125
=25×4×(0.8×125)
=100×100
=10000;

(2)class="stub"1
25
×99+class="stub"1
25

=class="stub"1
25
×(99+1)
=class="stub"1
25
×100
=4;

(3)class="stub"81
83
×82
=class="stub"81
83
×(83-1)
=class="stub"81
83
×83-class="stub"81
83
×1
=81-class="stub"81
83

=80class="stub"2
83


(4)class="stub"4
7
×20+8÷class="stub"7
4

=class="stub"4
7
×20+8×class="stub"4
7

=class="stub"4
7
×(20+8)
=class="stub"4
7
×28
=16;

(5)5×(class="stub"1
3
-class="stub"1
5
)÷class="stub"5
12

=5×class="stub"2
15
×class="stub"12
5

=class="stub"8
5


(6)4class="stub"1
5
×8×2class="stub"1
7

=class="stub"21
5
×8×class="stub"15
7

=72.

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