(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)
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(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)
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(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)
=(2x-y)(2x+y+y-4x)+2y(y-3x)
=2(2x-y)(y-3x)+2y(y-3x)
=(4x-2y+2y)(y-3x)
=4x(y-3x)
如果本题有什么不明白可以追问,
=(2x-y)(2x+y+y-4x)+2y(y-3x)
=2(2x-y)(y-3x)+2y(y-3x)
=(4x-2y+2y)(y-3x)
=4x(y-3x)
如果本题有什么不明白可以追问,
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