题目内容
化简:
(1)5(2x-7y-1)-3(4x-10y-2);
(2)
x-2(x-
y2)+(-
x+
y2).
(1)5(2x-7y-1)-3(4x-10y-2);
(2)
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(1)原式=10x-35y-5-12x+30y+6,
=10x-12x-35y+30y-5+6,
=-2x-5y+1;
(2)原式=
x-2x+
y2-
x+
y2,
=
x-
x-2x+
y2+
y2,
=-3x+y2.
=10x-12x-35y+30y-5+6,
=-2x-5y+1;
(2)原式=
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=
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=-3x+y2.
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