已知(x+y)²=10,(x-y)²=6,求x²+y²及xy的值 求速解
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已知(x+y)²=10,(x-y)²=6,求x²+y²及xy的值 求速解
已知(x+y)²=10,(x-y)²=6,求x²+y²及xy的值 求速解
已知(x+y)²=10,(x-y)²=6,求x²+y²及xy的值 求速解
x^2+y^2=m,xy=n
m+2n=10;m-2n=6;
m=8,n=1