已知x^2-y^2=27,x-y=3则xy=____,x^2+y^2=_____
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已知x^2-y^2=27,x-y=3则xy=____,x^2+y^2=_____已知x^2-y^2=27,x-y=3则xy=____,x^2+y^2=_____已知x^2-y^2=27,x-y=3则x
已知x^2-y^2=27,x-y=3则xy=____,x^2+y^2=_____
已知x^2-y^2=27,x-y=3则xy=____,x^2+y^2=_____
已知x^2-y^2=27,x-y=3则xy=____,x^2+y^2=_____
x^2-y^2=27 (x+y)(x-y)=27 x-y=3 x+y=9 2x=12 x=6,y=9-x=9-6=3 x^2+y^2=36+9 =45
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