若x-y=2,则2分之1(x²+y²)-xy=?
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若x-y=2,则2分之1(x²+y²)-xy=?
若x-y=2,则2分之1(x²+y²)-xy=?
若x-y=2,则2分之1(x²+y²)-xy=?
若x-y=2,则2分之1(x²+y²)-xy=?
2分之1(x²+y²)-xy=1/2(x²+y²-2xy)=1/2(x-y)²=1/2*4=2