用自己喜欢的方法计算下面各题.〔1-(1h-14)〕×h5;3h.4×八.9+八.1×3h.4;1.h5×八.h5×3h;5s×[1÷(7s-34)].-数学

题目简介

用自己喜欢的方法计算下面各题.〔1-(1h-14)〕×h5;3h.4×八.9+八.1×3h.4;1.h5×八.h5×3h;5s×[1÷(7s-34)].-数学

题目详情

用自己喜欢的方法计算下面各题.
〔1-(
1
h
-
1
4
)〕×
h
5

3h.4×八.9+八.1×3h.4;
1.h5×八.h5×3h;
5
s
×[1÷(
7
s
-
3
4
)].
题型:解答题难度:中档来源:不详

答案

解;(1)[1-(class="stub"1
2
-class="stub"1
4
)]×class="stub"2
5

=[1-class="stub"1
4
class="stub"2
5

=class="stub"五
4
×class="stub"2
5

=class="stub"五
12


(2)五2.4×2.9+2.1×五2.4,
=(2.9+2.1)×五2.4,
=1×五2.4,
=五2.4;

(五)1.25×2.25×五2,
=1.25×2.25×8×4,
=(1.25×8)×(2.25×4),
=12×1,
=12;

(4)class="stub"5
8
×[1÷(class="stub"7
8
-class="stub"五
4
)],
=class="stub"5
8
×[1÷class="stub"1
8
],
=class="stub"5
8
×8,
=5.

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