问题
解答题
化简: (1)5(2x-7y-1)-3(4x-10y-2); (2)
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答案
(1)原式=10x-35y-5-12x+30y+6,
=10x-12x-35y+30y-5+6,
=-2x-5y+1;
(2)原式=
x-2x+1 2
y2-2 3
x+3 2
y2,1 3
=
x-1 2
x-2x+3 2
y2+2 3
y2,1 3
=-3x+y2.
化简: (1)5(2x-7y-1)-3(4x-10y-2); (2)
|
(1)原式=10x-35y-5-12x+30y+6,
=10x-12x-35y+30y-5+6,
=-2x-5y+1;
(2)原式=
x-2x+1 2
y2-2 3
x+3 2
y2,1 3
=
x-1 2
x-2x+3 2
y2+2 3
y2,1 3
=-3x+y2.