计算:(x√y/x-2y√x/y)(x√y/x+2y√x/y)求你们帮帮忙啊
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计算:(x√y/x-2y√x/y)(x√y/x+2y√x/y)求你们帮帮忙啊计算:(x√y/x-2y√x/y)(x√y/x+2y√x/y)求你们帮帮忙啊计算:(x√y/x-2y√x/y)(x√y/x+
计算:(x√y/x-2y√x/y)(x√y/x+2y√x/y)求你们帮帮忙啊
计算:(x√y/x-2y√x/y)(x√y/x+2y√x/y)求你们帮帮忙啊
计算:(x√y/x-2y√x/y)(x√y/x+2y√x/y)求你们帮帮忙啊
(x√y/x-2y√x/y)(x√y/x+2y√x/y)
=(√xy-2√xy)(√xy+2√xy)
=-√xy * 3√xy
=-3xy
用平方差公式
原式=(x√y/x)^2-(2y√x/y)^2 = xy-4xy= -3xy
计算:{x√x+x√y / xy-y²}-{x+√xy+y / x√x-y√y}
计算:(x√y/x-2y√x/y)(x√y/x+2y√x/y)求你们帮帮忙啊
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