计算下面各题,能简算的要简算.(1.5+0.7)×(0.09÷1.8)815÷9+19×71571.2-2.3×1.6-6.3219÷[47×(23+14)].-数学

题目简介

计算下面各题,能简算的要简算.(1.5+0.7)×(0.09÷1.8)815÷9+19×71571.2-2.3×1.6-6.3219÷[47×(23+14)].-数学

题目详情

计算下面各题,能简算的要简算.
(1.5+0.7)×(0.09÷1.8)
8
15
÷9+
1
9
×
7
15

71.2-2.3×1.6-6.32
1
9
÷[
4
7
×(
2
3
+
1
4
)]
题型:解答题难度:中档来源:不详

答案

(1)(1.5+0.7)×(0.09÷1.8)
=2.2×0.05,
=0.11;

(2)class="stub"8
15
÷9+class="stub"1
9
×class="stub"7
15

=class="stub"8
15
×class="stub"1
9
+class="stub"1
9
×class="stub"7
15

=(class="stub"8
15
+class="stub"7
15
)×class="stub"1
9

=1×class="stub"1
9

=class="stub"1
9


(3)71.2-2.3×1.6-6.32
=71.2-3.68-6.32,
=71.2-(3.68+6.32),
=71.2-10,
=61.2;

(4)class="stub"1
9
÷[class="stub"4
7
×(class="stub"2
3
+class="stub"1
4
)]

=class="stub"1
9
÷[class="stub"4
7
×class="stub"11
12
],
=class="stub"1
9
÷class="stub"11
21

=class="stub"7
33

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