计算(1)(-2011)0+(-3)2-(14)-1(2)m2-(-n)3-(mn)4(3)(x2+2x-1)(x-1)(4)(x-2y)2-(x+2y)(x-2y)-数学

题目简介

计算(1)(-2011)0+(-3)2-(14)-1(2)m2-(-n)3-(mn)4(3)(x2+2x-1)(x-1)(4)(x-2y)2-(x+2y)(x-2y)-数学

题目详情

计算
(1)(-2011)0+(-3)2-(
1
4
-1               (2)m2-(-n)3-(mn)4
(3)(x2+2x-1)(x-1)(4)(x-2y)2-(x+2y)(x-2y)
题型:解答题难度:中档来源:不详

答案

(1)(-2011)0+(-3)2-(class="stub"1
4
)-1,
=1+9-4,
=6;

(2)m2•(-n)3•(mn)4,
=-m2n3m4n4,
=-m6n7;

(3)(x2+2x-1)(x-1),
=x3+2x2-x-x2-2x+1,
=x3+x2-3x+1;

(4)(x-2y)2-(x+2y)(x-2y),
=x2-4xy+4y2-(x2-4y2),
=x2-4xy+4y2-x2+4y2,
=-4xy+8y2.

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