问题
解答题
计算 (1)(9x2+2x+y)-(5x2+2x-y) (2)(
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答案
(1)原式=9x2+2x+y-5x2-2x+y
=4x2+2y;
(2)原式=
mn×(-2m2)+n2×(-2m2)1 2
=-m3n-2m2n2.
计算 (1)(9x2+2x+y)-(5x2+2x-y) (2)(
|
(1)原式=9x2+2x+y-5x2-2x+y
=4x2+2y;
(2)原式=
mn×(-2m2)+n2×(-2m2)1 2
=-m3n-2m2n2.