摘要:22.575 2 ×12 - 425 2 ×12
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计算:
(1)12-(-18)+(-7)-15;
(2)-1•5×
÷(-
);
(3)-24÷(-4)2;
(4)(-125)×(
+
-1
);
(5)
-(
-4).
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(1)12-(-18)+(-7)-15;
(2)-1•5×
| 2 |
| 5 |
| 1 |
| 2 |
(3)-24÷(-4)2;
(4)(-125)×(
| 4 |
| 25 |
| 1 |
| 5 |
| 4 |
| 5 |
(5)
| 3 | -1 |
| 3 | 8 |
下列计算错误的个数是( )
①(
)2=4,②-52=25,③
=
,④-(-
)2=
,
⑤-(-14)=1,⑥-(-0.1)3=0.001,⑦|a|=|-5|,则a=-5,⑧-a=-2,则a=2.
①(
| 1 |
| 2 |
| 42 |
| 5 |
| 16 |
| 25 |
| 1 |
| 9 |
| 1 |
| 81 |
⑤-(-14)=1,⑥-(-0.1)3=0.001,⑦|a|=|-5|,则a=-5,⑧-a=-2,则a=2.
| A、5个 | B、4个 | C、3个 | D、2个 |
计算:
(1)3-[(-3)-12]
(2)-4.2+5.7-7.6+10.1-5.5
(3)(-3
)+(-2.4)-(-
)+
(4)(-3
)×(-2.5)×4×(-
)
(5)4.8×(-5)
(6)(-
)×(14-1
+
)
(7)4.61×
+5.39×
+(-3)×
.
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(1)3-[(-3)-12]
(2)-4.2+5.7-7.6+10.1-5.5
(3)(-3
| 1 |
| 3 |
| 1 |
| 6 |
|
(4)(-3
| 1 |
| 3 |
| 3 |
| 10 |
(5)4.8×(-5)
(6)(-
| 5 |
| 7 |
| 2 |
| 5 |
| 1 |
| 5 |
(7)4.61×
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |