已知x²+y²+xy-3y+3=0,求x的y次方的值,快!
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已知x²+y²+xy-3y+3=0,求x的y次方的值,快!
已知x²+y²+xy-3y+3=0,求x的y次方的值,快!
已知x²+y²+xy-3y+3=0,求x的y次方的值,快!
上式 = (x^2 + xy + y^2 /4) + 3*(y^2 /4 - y + 1) = (x + y/2)^2 + 3 * (y/2 - 1)^2 = 0
只有当:x + y/2 = 0,y/2 - 1 = 0 时上式才能成立.
即:y = 2,x = -1