x^2+4y^2-2x+4y+5=0 ==> (x-1)^2+(2y+1)^3+3=0 无解?还是要用到 虚数什么的
已知x^2+4y^2-2x+4y+5=0,求2x^2+xy-y^2分之x^4-y^4乘以xy-y^2分之2x-y除以(x
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