题目内容
计算:
(1)8+(-
)-5-(-0.25);
(2)-22×7-(-3)×6+5;
(3)-4.2-(-3
)+(-5.8)+|-5
|;
(4)70
÷(-5);
(5)(-
+
-
)÷
-8÷(-3)2;
(6)(-49)×(-0.125)+49×(-
)-49×(-
).
(1)8+(-
| 1 |
| 4 |
(2)-22×7-(-3)×6+5;
(3)-4.2-(-3
| 3 |
| 7 |
| 4 |
| 7 |
(4)70
| 15 |
| 16 |
(5)(-
| 7 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 36 |
(6)(-49)×(-0.125)+49×(-
| 1 |
| 8 |
| 4 |
| 7 |
(1)原式=8+(-0.25)-5+0.25=(8-5)+(-0.25+0.25)=3;
(2)原式=-4×7+3×6+5=-28+18+5=-5;
(3)原式=[(-4.2)+(-5.8)]+(3
+5
)=-10+9=-1;
(4)原式=(70+
)×(-
)=-14-
=-14
;
(5)原式=(-
+
-
)×36-8÷9=-
×36+
×36-
×36-
=-28+30-27-
=-25
;
(6)原式=49×0.125-49×
+49×
=49×[0.125-
+
]=49×
=28.
(2)原式=-4×7+3×6+5=-28+18+5=-5;
(3)原式=[(-4.2)+(-5.8)]+(3
| 3 |
| 7 |
| 4 |
| 7 |
(4)原式=(70+
| 15 |
| 16 |
| 1 |
| 5 |
| 3 |
| 16 |
| 3 |
| 16 |
(5)原式=(-
| 7 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
| 7 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
(6)原式=49×0.125-49×
| 1 |
| 8 |
| 4 |
| 7 |
| 1 |
| 8 |
| 4 |
| 7 |
| 4 |
| 7 |
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