题目内容
计算:
(1)(-
+
-
)×(+24)
(2)(-4
)-(-5
)+(-4
)-(+3
)
(3)-14-
×[2-(-3)2]
(4)0.25×(-2)3-[4÷(-
)2+1]+(-1)2007.
(1)(-
1 |
2 |
2 |
3 |
1 |
4 |
(2)(-4
7 |
8 |
1 |
2 |
1 |
4 |
1 |
8 |
(3)-14-
1 |
6 |
(4)0.25×(-2)3-[4÷(-
2 |
3 |
分析:(1)利用乘法的分配律进行计算即可;
(2)先把同分母的分数相加,再再把异分母的分数通分,相加即可;
(3)根据运算顺序,先算乘方再算乘除,最后算加减,有括号的先算括号里面的;
(4)根据运算顺序,先算乘方再算乘除,最后算加减,有括号的先算括号里面的.
(2)先把同分母的分数相加,再再把异分母的分数通分,相加即可;
(3)根据运算顺序,先算乘方再算乘除,最后算加减,有括号的先算括号里面的;
(4)根据运算顺序,先算乘方再算乘除,最后算加减,有括号的先算括号里面的.
解答:解:(1)原式=-
×24+
×24-
×24
=-12+16-6
=-2;
(2)原式=(-4
3
)+5
-4
=-8+5
-4
=-8+1
=-6
;
(3)原式=-1-
×(2-9)
=-1+
=
;
(4)原式=
×(-8)-(4×
+1)-1
=-2-10-1
=-13.
1 |
2 |
2 |
3 |
1 |
4 |
=-12+16-6
=-2;
(2)原式=(-4
7 |
8 |
1 |
8 |
1 |
2 |
1 |
4 |
=-8+5
2 |
4 |
1 |
4 |
=-8+1
1 |
4 |
=-6
3 |
4 |
(3)原式=-1-
1 |
6 |
=-1+
7 |
6 |
=
1 |
6 |
(4)原式=
1 |
4 |
9 |
4 |
=-2-10-1
=-13.
点评:本题考查了有理数的混合运算以及乘法的分配律,是基础知识比较简单.
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