问题 解答题
化简:
(1)5(2x-7y-1)-3(4x-10y-2);
(2)
1
2
x-2(x-
1
3
y2)+(-
3
2
x+
1
3
y2)
答案

(1)原式=10x-35y-5-12x+30y+6,

=10x-12x-35y+30y-5+6,

=-2x-5y+1;

(2)原式=

1
2
x-2x+
2
3
y2-
3
2
x+
1
3
y2

=

1
2
x-
3
2
x-2x+
2
3
y2+
1
3
y2

=-3x+y2

单项选择题
单项选择题