下面各题怎样简便就怎样算.(1)25÷34÷115(2)(35+16)×37(3)13.2÷(3.2×3-0.8)(4)79÷[(58-14)×12].-数学

题目简介

下面各题怎样简便就怎样算.(1)25÷34÷115(2)(35+16)×37(3)13.2÷(3.2×3-0.8)(4)79÷[(58-14)×12].-数学

题目详情

下面各题怎样简便就怎样算.
(1)
2
5
÷
3
4
÷
1
15

(2)(
3
5
+
1
6
)×
3
7

(3)13.2÷(3.2×3-0.8)
(4)
7
9
÷[(
5
8
-
1
4
)×12].
题型:解答题难度:中档来源:不详

答案

(1)class="stub"2
5
÷class="stub"3
4
÷class="stub"1
15

=class="stub"2
5
×class="stub"4
3
×15,
=8;

(2)(class="stub"3
5
+class="stub"1
6
)×class="stub"3
7

=(class="stub"18
30
+class="stub"5
30
)×class="stub"3
7

=class="stub"23
30
×class="stub"3
7

=class="stub"23
70


(3)13.2÷(3.2×3-0.8),
=13.2÷(9.6-0.8),
=13.2÷8.8,
=1.5;

(4)class="stub"7
9
÷[(class="stub"5
8
-class="stub"1
4
)×12],
=class="stub"7
9
÷[class="stub"3
8
×12],
=class="stub"7
9
÷class="stub"9
2

=class="stub"7
9
×class="stub"2
9

=class="stub"14
81

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