题目内容
计算
(1)-20-(+14)+(-18)-(-13);
(2)-2
-(-
)+3
+(-2
)
(3)-7×
+(-5)×(-
)-
;
(4)(-3)2÷
×(-
)-[1+(-2)3].
(5)[2-5×(-
)2]÷(-
);
(6)-32-
×[(-5)2×(-
)-240÷(-4)×
].
(1)-20-(+14)+(-18)-(-13);
(2)-2
3 |
4 |
1 |
8 |
3 |
8 |
1 |
4 |
(3)-7×
5 |
4 |
5 |
4 |
2 |
5 |
(4)(-3)2÷
3 |
4 |
1 |
2 |
(5)[2-5×(-
1 |
2 |
1 |
4 |
(6)-32-
1 |
3 |
3 |
5 |
1 |
4 |
(1)原式=-20-14-18+13
=-39;
(2)原式=-2
+
+3
-2
=(-2
-2
)+(
+3
)
=-5+3
=-1
;
(3)原式=-
+
-
=-
-
=-
-
=-
;
(4)原式=9÷
×(-
)-(-7)
=9×
×(-
)+7
=12×(-
)+7
=-6+7
=1;
(5)原式=[2-
]×(-4)
=
×(-4)
=-3;
(6)原式=-9-
×[25×(-
)+60×
]
=-9-
×[-15+15]
=-9.
=-39;
(2)原式=-2
3 |
4 |
1 |
8 |
3 |
8 |
1 |
4 |
=(-2
3 |
4 |
1 |
4 |
1 |
8 |
3 |
8 |
=-5+3
1 |
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 |
1 |
2 |
=9×
4 |
3 |
1 |
2 |
=12×(-
1 |
2 |
=-6+7
=1;
(5)原式=[2-
5 |
4 |
=
3 |
4 |
=-3;
(6)原式=-9-
1 |
3 |
3 |
5 |
1 |
4 |
=-9-
1 |
3 |
=-9.
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