问题
解答题
化简
(1)(-2y2)3+y-y5
(2)(x+2)2-(x+1)(x-1)
答案
(1)(-2y2)3+y•y5
=-8y6+y6
=-7y6;
(2)(x+2)2-(x+1)(x-1)
=x2+4x+4-x2+1
=4x+5.
化简
(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.