题目内容
计算
(1)-6-(-9)+(-3)+(-4)
(2)(-
+
-
)×(-48)×24
(3)-13-(1+0.5)×
÷(-4)
(4)-2x2y+xy+13xy-(-5x2y)
(1)-6-(-9)+(-3)+(-4)
(2)(-
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 12 |
(3)-13-(1+0.5)×
| 1 |
| 3 |
(4)-2x2y+xy+13xy-(-5x2y)
(1)原式=-6+9-3-4
=-13+9
=-4;
(2)原式=-
×24+
×24-
×24
=-4+18-2
=-6+18
=12;
(3)原式=-1-1.5×
×(-
)
=-1+
=-
;
(4)原式=-2x2y+xy+13xy+5x2y
=3x2y+14xy.
=-13+9
=-4;
(2)原式=-
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 12 |
=-4+18-2
=-6+18
=12;
(3)原式=-1-1.5×
| 1 |
| 3 |
| 1 |
| 4 |
=-1+
| 1 |
| 8 |
=-
| 7 |
| 8 |
(4)原式=-2x2y+xy+13xy+5x2y
=3x2y+14xy.
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