题目内容
计算
(1)(9x2+2x+y)-(5x2+2x-y)
(2)(
mn+n2)×(-2m2)
(1)(9x2+2x+y)-(5x2+2x-y)
(2)(
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(1)原式=9x2+2x+y-5x2-2x+y
=4x2+2y;
(2)原式=
mn×(-2m2)+n2×(-2m2)
=-m3n-2m2n2.
=4x2+2y;
(2)原式=
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=-m3n-2m2n2.
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