问题 解答题
计算:
(1)-32×1.22÷0.32+(-
1
3
)2×(-3)3÷(-1)2007

(2)3x2y-2[x2y-(xy-
1
4
x2)-2x2]
答案

(1)原式=-9×

36
25
×
100
9
+
1
9
×(-27)÷(-1)

=-144+3

=-141;

(2)原式=3x2y-2(x2y-xy+

1
4
x2-2x2

=3x2y-2x2y+2xy-

1
2
x2+4x2

=x2y+2xy+

7
2
x2

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