化简:(1)11x2+4x-1-x2-4x-5 (2)(2xy-y)-(-y+xy)
问题描述:
化简:(1)11x2+4x-1-x2-4x-5
(2)(2xy-y)-(-y+xy)
答
(1)11x2+4x-1-x2-4x-5,
=11x2-x2-4x+4x-1-5,
=(11-1)x2-(1-1)x-1-5,
=10x2-6;
(2)(2xy-y)-(-y+xy),
=2xy-y+y-xy,
=xy.