题目内容
计算:
(1)-7+13-6+20;
(2)(-49)-(+91)-(-5)+(-9);
(3)1+(-2)+|-2-3|-5;
(4)(-5)×(-7)-5×(-6);
(5)(-
)÷(-
)÷(-0.25);
(6)-2•(-
)2+|-(-2)|3-(-
).
(1)-7+13-6+20;
(2)(-49)-(+91)-(-5)+(-9);
(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=-7-6+13+20=20;
(2)原式=(-49+5)+(-91-9)=-44-100=-144;
(3)原式=1-2+5-5=-1;
(4)原式=-5×(-7-6)=65;
(5)原式=
×
×(-4)=-
;
(6)原式=-2×
+8+
=-
+
+8=8.
(2)原式=(-49+5)+(-91-9)=-44-100=-144;
(3)原式=1-2+5-5=-1;
(4)原式=-5×(-7-6)=65;
(5)原式=
| 2 |
| 3 |
| 5 |
| 8 |
| 5 |
| 3 |
(6)原式=-2×
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
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