题目内容
计算:
(1)-32×1.22÷0.32+(-
)2×(-3)3÷(-1)2007;
(2)3x2y-2[x2y-(xy-
x2)-2x2].
(1)-32×1.22÷0.32+(-
| 1 |
| 3 |
(2)3x2y-2[x2y-(xy-
| 1 |
| 4 |
(1)原式=-9×
×
+
×(-27)÷(-1)
=-144+3
=-141;
(2)原式=3x2y-2(x2y-xy+
x2-2x2)
=3x2y-2x2y+2xy-
x2+4x2
=x2y+2xy+
x2.
| 36 |
| 25 |
| 100 |
| 9 |
| 1 |
| 9 |
=-144+3
=-141;
(2)原式=3x2y-2(x2y-xy+
| 1 |
| 4 |
=3x2y-2x2y+2xy-
| 1 |
| 2 |
=x2y+2xy+
| 7 |
| 2 |
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