题目内容
计算题
(1)-3+4+7-5;
(2)(-2)×
÷(-
)×4;
(3)(
+
-
)×(-24);
(4)-16+8÷(-2)2-(-4)×(-3).
(1)-3+4+7-5;
(2)(-2)×
| 3 |
| 2 |
| 3 |
| 4 |
(3)(
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
(4)-16+8÷(-2)2-(-4)×(-3).
(1)-3+4+7-5
=[(-3)+(-5)]+(4+7)
=-8+11 (2分)
=3;(4分)
(2)(-2)×
÷(-
)×4
=(-3)×(-
)×4(2分)
=4×4(3分)
=16;(4分)
(3)(
+
-
)×(-24)
=
×(-24)+
×(-24)-
×(-24)
=-12-20+14 (2分)
=-32+14 (3分)
=-18;(4分)
(4)-16+8÷(-2)2-(-4)×(-3)
=-1+8÷4-12(3分)
=-1+2-12
=-11.(4分)
=[(-3)+(-5)]+(4+7)
=-8+11 (2分)
=3;(4分)
(2)(-2)×
| 3 |
| 2 |
| 3 |
| 4 |
=(-3)×(-
| 4 |
| 3 |
=4×4(3分)
=16;(4分)
(3)(
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
=
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
=-12-20+14 (2分)
=-32+14 (3分)
=-18;(4分)
(4)-16+8÷(-2)2-(-4)×(-3)
=-1+8÷4-12(3分)
=-1+2-12
=-11.(4分)
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