计算:(1)(57-23)÷521×5(2)45×7.7+3.3×0.8-80%-数学

题目简介

计算:(1)(57-23)÷521×5(2)45×7.7+3.3×0.8-80%-数学

题目详情

计算:
(1)(
5
7
-
2
3
÷
5
21
×5
(2)
4
5
×7.7+3.3×0.8-80%
题型:解答题难度:中档来源:不详

答案

(1)(class="stub"5
7
-class="stub"2
3
÷class="stub"5
21
×5

=(class="stub"5
7
-class="stub"2
3
)×class="stub"21
5
×5

=class="stub"5
7
×class="stub"21
5
×5-class="stub"2
3
×class="stub"21
5
×5

=15-14,
=1;

(2)class="stub"4
5
×7.7+3.3×0.8-80%,
=0.8×7.7+3.3×0.8-80%,
=0.8×(7.7+3.3-1),
=0.8×10,
=8.

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