(3)(4x-2y)-[5x-(8y-2x-y)]+x (4)-(2x²-3x-1)-2(x²-3x+5)+(x²+4x+3)
人气：355 ℃ 时间：2019-10-11 20:42:08
解答
(4x-2y)-[5x-(8y-2x-y)]+x
=4x-2y-5x+8y-2x-y+x
=-2x+6y
-(2x²-3x-1)-2(x²-3x+5)+(x²+4x+3)
=-2x²+3x+1-2x²+6x-10+x²+4x+3
=-3x²+13x-6
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