问题
解答题
计算 (1)-20-(+14)+(-18)-(-13); (2)-2
(3)-7×
(4)(-3)2÷
(5)[2-5×(-
(6)-32-
|
答案
(1)原式=-20-14-18+13
=-39;
(2)原式=-2
+3 4
+31 8
-23 8 1 4
=(-2
-23 4
)+(1 4
+31 8
)3 8
=-5+31 2
=-1
;1 2
(3)原式=-
+35 4
-25 4 2 5
=-
-5 2 2 5
=-
-25 10 4 10
=-
;29 10
(4)原式=9÷
×(-3 4
)-(-7)1 2
=9×
×(-4 3
)+71 2
=12×(-
)+71 2
=-6+7
=1;
(5)原式=[2-
]×(-4)5 4
=
×(-4)3 4
=-3;
(6)原式=-9-
×[25×(-1 3
)+60×3 5
]1 4
=-9-
×[-15+15]1 3
=-9.