已知(x²+y²)-y²=x²+6,则x²+y平方的值是则x²+y²的值是
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![已知(x²+y²)-y²=x²+6,则x²+y平方的值是则x²+y²的值是](/uploads/image/z/3840917-5-7.jpg?t=%E5%B7%B2%E7%9F%A5%28x%26%23178%3B%2By%26%23178%3B%29-y%26%23178%3B%3Dx%26%23178%3B%2B6%2C%E5%88%99x%26%23178%3B%2By%E5%B9%B3%E6%96%B9%E7%9A%84%E5%80%BC%E6%98%AF%E5%88%99x%26%23178%3B%2By%26%23178%3B%E7%9A%84%E5%80%BC%E6%98%AF)
已知(x²+y²)-y²=x²+6,则x²+y平方的值是则x²+y²的值是
已知(x²+y²)-y²=x²+6,则x²+y平方的值是
则x²+y²的值是
已知(x²+y²)-y²=x²+6,则x²+y平方的值是则x²+y²的值是
(x²+y²)²-y²=x²+6;
(x²+y²)²-(x²+y²)=6;
设x²+y²=m;
m²-m-6=0;
(m-3)(m+2)=0;
m=3或m=-2;
x²+y²>=0;
所以只能等于3;
(x²+y²)-y²=x²+6,
(x²+y²)=x²+6+y²=(x²+y²)+6
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