若M=y/x^2-xy,N=x/y^2-xy,P=2/x-y,则M-N-P=
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若M=y/x^2-xy,N=x/y^2-xy,P=2/x-y,则M-N-P=若M=y/x^2-xy,N=x/y^2-xy,P=2/x-y,则M-N-P=若M=y/x^2-xy,N=x/y^2-xy,P
若M=y/x^2-xy,N=x/y^2-xy,P=2/x-y,则M-N-P=
若M=y/x^2-xy,N=x/y^2-xy,P=2/x-y,则M-N-P=
若M=y/x^2-xy,N=x/y^2-xy,P=2/x-y,则M-N-P=
若M=y/(x^2-xy),N=x/(y^2-xy),P=2/(x-y),那么:
M-N-P
=y/(x^2-xy) - x/(y^2-xy) - 2/(x-y)
=y/[x(x-y)] + x/[y(x-y)] - 2/(x-y)
=(y²+x²-2xy)/[xy(x-y)]
=(x-y)²/[xy(x-y)]
=(x-y)/(xy)
或可 =(1/y) - (1/x)
若x²y+M=xy(N+2xy),则M=( ),N=( )
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