(x+y)^2/y^2-xy÷[-y^2+xy/(x-y)^2,x=0,y=根号10
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(x+y)^2/y^2-xy÷[-y^2+xy/(x-y)^2,x=0,y=根号10(x+y)^2/y^2-xy÷[-y^2+xy/(x-y)^2,x=0,y=根号10(x+y)^2/y^2-xy÷[
(x+y)^2/y^2-xy÷[-y^2+xy/(x-y)^2,x=0,y=根号10
(x+y)^2/y^2-xy÷[-y^2+xy/(x-y)^2,x=0,y=根号10
(x+y)^2/y^2-xy÷[-y^2+xy/(x-y)^2,x=0,y=根号10
原式=(x+y)²/y(x-y)×(x-y)²/y(x+y)
=(x+y)(x-y)/y²
=(x²-y²)/y²
=(0-10)/10
=-1
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