题目内容
计算
(1)(-4)-(+8)-(-5)+(-9);
(2)(-5)×(-7)-5×(-6)
(3)(-9)÷
×
÷(-4)
(4)(1-
-
)×(-12)
(5)3+50÷(-2)2×(-
)-1.
(1)(-4)-(+8)-(-5)+(-9);
(2)(-5)×(-7)-5×(-6)
(3)(-9)÷
| 3 |
| 2 |
| 2 |
| 3 |
(4)(1-
| 1 |
| 2 |
| 1 |
| 3 |
(5)3+50÷(-2)2×(-
| 1 |
| 5 |
(1)原式=-4-8+5-9
=-12+5-9
=-7-9
=-16;
(2)原式=35+30
=65;
(3)原式=(-9)×
×
×(-
)
=(-6)×
×(-
)
=(-4)×(-
)
=1;
(4)原式=1×(-12)-
×(-12)-
×(-12)
=-12+6+4
=-2;
(5)原式=3+50÷4×(-
)-1
=3+50×
×(-
)-1
=3+
×(-
)-1
=3-
-1
=-
.
=-12+5-9
=-7-9
=-16;
(2)原式=35+30
=65;
(3)原式=(-9)×
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
=(-6)×
| 2 |
| 3 |
| 1 |
| 4 |
=(-4)×(-
| 1 |
| 4 |
=1;
(4)原式=1×(-12)-
| 1 |
| 2 |
| 1 |
| 3 |
=-12+6+4
=-2;
(5)原式=3+50÷4×(-
| 1 |
| 5 |
=3+50×
| 1 |
| 4 |
| 1 |
| 5 |
=3+
| 25 |
| 2 |
| 1 |
| 5 |
=3-
| 5 |
| 2 |
=-
| 1 |
| 2 |
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