4(x+2y)^-9(x-y)^怎么算
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4(x+2y)^-9(x-y)^怎么算
4(x+2y)^-9(x-y)^怎么算
4(x+2y)^-9(x-y)^怎么算
题目应是4(x+2y)^2-9(x-y)^2
=(2(x+2y)+3(x-y))(2(x+2y)-3(x-y))
=(5x+y)(-x+7y)
4(x+2y)^-9(x-y)^
=(2x+4y+3x-3y)(2x+4y-3x+3y)
=(5x+y)(-x+7y)
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