脱式计算,能简算的要简算.79÷5+19×15920÷[12+(35-12)](12+13-16)×18.-数学

题目简介

脱式计算,能简算的要简算.79÷5+19×15920÷[12+(35-12)](12+13-16)×18.-数学

题目详情

脱式计算,能简算的要简算.
7
9
÷5+
1
9
×
1
5
9
20
÷[
1
2
+(
3
5
-
1
2
)]
1
2
+
1
3
-
1
6
)×18.
题型:解答题难度:中档来源:不详

答案

(1)class="stub"7
9
÷5+class="stub"1
9
×class="stub"1
5

=(class="stub"7
9
+class="stub"1
9
)×class="stub"1
5

=class="stub"8
9
×class="stub"1
5

=class="stub"8
45


(2)class="stub"9
20
÷[class="stub"1
2
+(class="stub"3
5
-class="stub"1
2
)]

=class="stub"9
20
÷
[class="stub"1
2
+class="stub"1
10
],
=class="stub"9
20
÷class="stub"12
20

=class="stub"3
4


(3)(class="stub"1
2
+class="stub"1
3
-class="stub"1
6
)×18,
=class="stub"1
2
×18+class="stub"1
3
×18-class="stub"1
6
×18,
=9+6-3,
=15-3,
=12.

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