已知x²-2xy-3y²=0,其中,x,y均不为零,求(y-x)÷ (x²-xy/2y)-
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已知x²-2xy-3y²=0,其中,x,y均不为零,求(y-x)÷ (x²-xy/2y)-(y-y²/xy-x)的值
已知x²-2xy-3y²=0,其中,x,y均不为零,求(y-x)÷(x²-xy/2y)-(y-y²/xy-x)的值.
已知x²-2xy-3y²=0,其中,x,y均不为零,求(y-x)÷(x²-xy/2y)-(y-y²/xy-x)的值.
x²-2xy-3y²=0
即(x+y)(x-3y)=0,可得
x=-y,x=3y
分别代入(y-x)÷ (x²-xy/2y)-(y-y²/xy-x)求值
当x=-y时,(y-x)÷ (x²-xy/2y)-(y-y²/xy-x)=2
当x=3y时,(y-x)÷ (x²-xy/2y)-(y-y²/xy-x)=-1/3
即(x+y)(x-3y)=0,可得
x=-y,x=3y
分别代入(y-x)÷ (x²-xy/2y)-(y-y²/xy-x)求值
当x=-y时,(y-x)÷ (x²-xy/2y)-(y-y²/xy-x)=2
当x=3y时,(y-x)÷ (x²-xy/2y)-(y-y²/xy-x)=-1/3
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