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计算[(x+2y)²-(2x-y)²]÷(3x+y)=
人气:348 ℃ 时间:2019-12-13 18:16:33
解答
[(x+2y)²-(2x-y)²]÷(3x+y)
=[(x+2y+2x-y)(x+2y-2x+y)]÷(3x+y)
=[(3x+y)(-x+3y)]]÷(3x+y)
=-x+3y
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