计算(1)-20-(+14)+(-18)-(-13);(2)-234-(-18)+338+(-214)(3)-7×54+(-5)×(-54)-25;(4)(-3)2÷34×(-12)-[1+(-2)3

题目简介

计算(1)-20-(+14)+(-18)-(-13);(2)-234-(-18)+338+(-214)(3)-7×54+(-5)×(-54)-25;(4)(-3)2÷34×(-12)-[1+(-2)3

题目详情

计算
(1)-20-(+14)+(-18)-(-13);
(2)-2
3
4
-(-
1
8
)+3
3
8
+(-2
1
4

(3)-7×
5
4
+(-5)×(-
5
4
)-
2
5

(4)(-3)2÷
3
4
×(-
1
2
)-[1+(-2)3].
(5)[2-5×(-
1
2
2]÷(-
1
4
);
(6)-32-
1
3
×[(-5)2×(-
3
5
)-240÷(-4)×
1
4
].
题型:解答题难度:中档来源:不详

答案

(1)原式=-20-14-18+13
=-39;
(2)原式=-2class="stub"3
4
+class="stub"1
8
+3class="stub"3
8
-2class="stub"1
4

=(-2class="stub"3
4
-2class="stub"1
4
)+(class="stub"1
8
+3class="stub"3
8

=-5+3class="stub"1
2

=-1class="stub"1
2


(3)原式=-class="stub"35
4
+class="stub"25
4
-class="stub"2
5

=-class="stub"5
2
-class="stub"2
5

=-class="stub"25
10
-class="stub"4
10

=-class="stub"29
10


(4)原式=9÷class="stub"3
4
×(-class="stub"1
2
)-(-7)
=9×class="stub"4
3
×(-class="stub"1
2
)+7
=12×(-class="stub"1
2
)+7
=-6+7
=1;

(5)原式=[2-class="stub"5
4
]×(-4)
=class="stub"3
4
×(-4)
=-3;

(6)原式=-9-class="stub"1
3
×[25×(-class="stub"3
5
)+60×class="stub"1
4
]
=-9-class="stub"1
3
×[-15+15]
=-9.

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