已知x^2-y^2=24,x-y=-6,求代数式5x+5y的值.快,请高手指教啊```````
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已知x^2-y^2=24,x-y=-6,求代数式5x+5y的值.快,请高手指教啊```````已知x^2-y^2=24,x-y=-6,求代数式5x+5y的值.快,请高手指教啊```````已知x^2-
已知x^2-y^2=24,x-y=-6,求代数式5x+5y的值.快,请高手指教啊```````
已知x^2-y^2=24,x-y=-6,求代数式5x+5y的值.快,请高手指教啊```````
已知x^2-y^2=24,x-y=-6,求代数式5x+5y的值.快,请高手指教啊```````
(x-y)(x+y)=24 6(x+y)=24 x+y=-4 5x+5y=5(x+y)=-20
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