问题
解答题
计算下列各题:
(1)2x2+3x-2x2-5x-5;
(2)(3x-5y)-(2x-5y).
答案
(1)原式=2x2-2x2+3x-5x-5
=-2x-5;
(2)原式=3x-5y-2x+5y
=3x-2x-5y+5y
=x.
计算下列各题:
(1)2x2+3x-2x2-5x-5;
(2)(3x-5y)-(2x-5y).
(1)原式=2x2-2x2+3x-5x-5
=-2x-5;
(2)原式=3x-5y-2x+5y
=3x-2x-5y+5y
=x.