题目内容
计算
(1)(-49)-(+91)-(-5)+(-9);
(2)-7+13-6+20;
(3)1+(-2)+|-2-3|-5;
(4)(-5)×(-7)-5×(-6);
(5)(-
)÷(-
)÷(-0.25);
(6)-2•(-
)2+|-(-2)|3-(-
).
(1)(-49)-(+91)-(-5)+(-9);
(2)-7+13-6+20;
(3)1+(-2)+|-2-3|-5;
(4)(-5)×(-7)-5×(-6);
(5)(-
| 2 |
| 3 |
| 8 |
| 5 |
(6)-2•(-
| 1 |
| 2 |
| 1 |
| 2 |
(1)原式=-140+5-9=-144;
(2)原式=(-7-6)+13+20=20;
(3)原式=-1+5-5=-1;
(4)原式=35+30=65;
(5)原式=-
×(-
)×(-4)=-
;
(6)原式=-2×
+8+
=8.
(2)原式=(-7-6)+13+20=20;
(3)原式=-1+5-5=-1;
(4)原式=35+30=65;
(5)原式=-
| 2 |
| 3 |
| 5 |
| 8 |
| 5 |
| 3 |
(6)原式=-2×
| 1 |
| 4 |
| 1 |
| 2 |
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