脱式计算3978÷39+2401.42×9.2+0.8×1.42920×(9-59÷5)(12+16-19)×18710÷[12×(45-110)](34+94×13)÷715.-数学

题目简介

脱式计算3978÷39+2401.42×9.2+0.8×1.42920×(9-59÷5)(12+16-19)×18710÷[12×(45-110)](34+94×13)÷715.-数学

题目详情

脱式计算
3978÷39+240  
1.42×9.2+0.8×1.42   
9
20
×(9-
5
9
÷5)
(
1
2
+
1
6
-
1
9
)×18
7
10
÷[
1
2
×(
4
5
-
1
10
)]
(
3
4
+
9
4
×
1
3
7
15
题型:解答题难度:中档来源:不详

答案

(1)3978÷39+240,
=102+240,
=342;

(2)1.42×9.2+0.8×1.42,
=1.42×(9.2+0.8),
=1.42×10,
=14.2;

(3)class="stub"9
20
×(9-class="stub"5
9
÷5),
=class="stub"9
20
×(9-class="stub"1
9
),
=class="stub"9
20
×class="stub"80
9

=4;

(4)(class="stub"1
2
+class="stub"1
6
-class="stub"1
9
)×18,
=class="stub"1
2
×18+class="stub"1
6
×18-class="stub"1
9
×18,
=9+3-2,
=10;

(5)class="stub"7
10
÷[class="stub"1
2
×(class="stub"4
5
-class="stub"1
10
)],
=class="stub"7
10
÷[class="stub"1
2
×class="stub"7
10
],
=class="stub"7
10
÷class="stub"7
20

=2;

(6)(class="stub"3
4
+class="stub"9
4
×class="stub"1
3
)÷class="stub"7
15

=(class="stub"3
4
+class="stub"3
4
÷class="stub"7
15

=class="stub"6
4
×class="stub"15
7

=class="stub"45
14

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