化简-(x方-2xy-y方)+(5x方-2xy-3y方)

化简-(x方-2xy-y方)+(5x方-2xy-3y方) ((3/2x方+xy-3/5y方)*(-4/3x方y方) (3/2x方+xy-3/5y方)*(-4/3x方y方) 换元法分解因式（x方+y方）（x方-xy+y方）-2x方y方 计算4x方-4xy+y方-4x+2y-15 4x方y方-5x方y方-9y方计算4x方-4xy+y方-4x+2y-15 4x方y方-5x方y方-9y方 已知x+y=5,x方+y方=13,求代数式x方y+2x方y方+xy方的值 3x方+5xy+2y方因式分解 2x方-5xy-7y方（因式分解） 2x方-8XY+5Y方=?怎麽算! 已知3X方-xy-4y方=0,求分式xy-3x方/2y方-5xy-3x方的值 计算 x方/x-y+y方/x-y-2x方y-2xy方/x方-2xy+y方 答案为x+y (1/2x方+xy-1.5y方)/(x方-y方) 已知x方+2xy-y方=7,求x方+y方的最小值 X方-5XY+3Y方 实数范围内因式分解-2X方-3X+64X方Y方+XY-1 因式分解 x方+y方-xy+2x-y+1 计算:（xy分之x+y）方-x方y方分之x方-y方 x方-xy+y方 等于? x方-xy+1/4y方