计算下列各题(1)(-7)+(+15)-(-25)(2)(-2)×(-7)×(+5)×(-17)(3)(-3)2-[(-23)+
计算下列各题(1)(-7)+(+15)-(-25)(2)(-2)×(-7)×(+5)×(-17)(3)(-3)2-[(-23)+(-14)]÷112(4)0.25×(-2...
计算下列各题(1)(-7)+(+15)-(-25)(2)(-2)×(-7)×(+5)×(-17)(3)(-3)2-[(-23)+(-14)]÷112 (4)0.25×(-2)3-[4÷(-23)2+1]+(-1)2005.
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(1)(-7)+(+15)-(-25)
=-7+15+25
=33;
(2)(-2)×(-7)×(+5)×(-
)
=-2×7×5×
=-10;
(3)(-3)2-[(-
)+(-
)]÷
=9-(-
)÷
=9-(-11)
=9+11
=20;
(4)0.25×(-2)3-[4÷(-
)2+1]+(-1)2005
=0.25×(-8)-[4÷
+1]+(-1)
=-2-10-1
=-13.
=-7+15+25
=33;
(2)(-2)×(-7)×(+5)×(-
1 |
7 |
=-2×7×5×
1 |
7 |
=-10;
(3)(-3)2-[(-
2 |
3 |
1 |
4 |
1 |
12 |
=9-(-
11 |
12 |
1 |
12 |
=9-(-11)
=9+11
=20;
(4)0.25×(-2)3-[4÷(-
2 |
3 |
=0.25×(-8)-[4÷
4 |
9 |
=-2-10-1
=-13.
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