若x3y=y2x−5y=6x−15yx,则4x2−5xy+6y2x2−2xy+3y2的值是( )
已知x2+y2-2x-4y+5=0,分式yx−xy
已知x2+3xy-4y2=0(y≠0),则x−yx+y
已知x2+y2-6x-8y+25=0,求代数式yx−xy
已知2x2-xy-3y2=0,求x−yx+y
已知x+y=2,x-y=12,则分式2x2-2y2x2+2xy+y2的值是 ___ .
已知2x2-3xy+y2=0(xy≠0),则xy+yx的值是( )
已知x+y=3,x2+y2-3xy=4,则x3y+xy3的值为______.
已知5x2-xy-6y2=0,则yx
若x<y<0,则x2−2xy+y2+x2+2xy+y2=( )
把下列各式分解因式:(1)x3y-xy3;(2)(x2+1)2-4x2;(3)先化简再求值,x−yx÷(x−2xy−y
已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是
已知1x−1y=3,则5x+xy−5yx−xy−y的值为( )