x(x-2)-(x²-2y)=-4求代数式1/2(x²+y²)-xy的值...
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x(x-2)-(x²-2y)=-4求代数式1/2(x²+y²)-xy的值...x(x-2)-(x²-2y)=-4求代数式1/2(x²+y²)
x(x-2)-(x²-2y)=-4求代数式1/2(x²+y²)-xy的值...
x(x-2)-(x²-2y)=-4求代数式1/2(x²+y²)-xy的值...
x(x-2)-(x²-2y)=-4求代数式1/2(x²+y²)-xy的值...