化简(1)(4x2y﹣3xy2)﹣(1+4x2y﹣3xy2)(2)3(4x2﹣3x+2)﹣2(1﹣4x2+x)(3)4y2﹣[3y﹣(3﹣2y)+2y2]-七年级数学

题目简介

化简(1)(4x2y﹣3xy2)﹣(1+4x2y﹣3xy2)(2)3(4x2﹣3x+2)﹣2(1﹣4x2+x)(3)4y2﹣[3y﹣(3﹣2y)+2y2]-七年级数学

题目详情

化简 (1)(4x2y﹣3xy2)﹣(1+4x2y﹣3xy2
(2)3(4x2﹣3x+2)﹣2(1﹣4x2+x)
(3)4y2﹣[3y﹣(3﹣2y)+2y2]
题型:计算题难度:中档来源:广东省期中题

答案

解:(1)原式=4x2y﹣3xy2﹣1﹣4x2y+3xy2
=(4﹣4)x2y+(﹣3+3)xy2﹣1
=﹣1;
(2)原式=12x2﹣9x+6﹣2+8x2﹣2x
=(12+8)x2+(﹣9﹣2)x+(6﹣2)
=20x2﹣11x+4;
(3)原式=4y2﹣[3y﹣3+2y+2y2]
=4y2﹣3y+3﹣2y﹣2y2
=(4﹣2)y2+(﹣3﹣2)y+3
=2y2﹣5y+3.

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