题目内容
化简
(1)(-2y2)3+y-y5
(2)(x+2)2-(x+1)(x-1)
(1)(-2y2)3+y-y5
(2)(x+2)2-(x+1)(x-1)
(1)(-2y2)3+y•y5
=-8y6+y6
=-7y6;
(2)(x+2)2-(x+1)(x-1)
=x2+4x+4-x2+1
=4x+5.
=-8y6+y6
=-7y6;
(2)(x+2)2-(x+1)(x-1)
=x2+4x+4-x2+1
=4x+5.
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