|x+y-4|+(xy-5)²等于0,则x²+y²等于?
|x+y-4|+(xy-5)²等于0,则x²+y²等于?
已知x²-5xy+6y²=0,则y比x等于
已知x²-5xy+6y²=0,那么x+y分之x-y等于多少
3x²y²-[5xy²-(4xy²-3)+2x²y²]等于多
若2x²—4x+2+根号x+2y—1等于0,那么xy等于几?
2x(x²y-xy²)+xy(xy-x²)]÷x²y等于多少
若2x=-y,则x²-y²分之xy等于
若x+y等于3,xy=1,则x²+y²
若y分之x等于3分之4,求2x²+3xy-5y²分之3x²-5xy+2y²的值
已知y分之x等于3分之4 求2x²+3xy-5y²分之3x²-5xy+2y²的值
3xy+xy+2x²y+yx²+3x²y等于多少
3y/2x+2y + 2xy/x²+xy等于多少过程