若x+y=3,xy=2,则x^4+y^4的值为多少

若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= 若|x-3|+（y+2）=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 若|x-3|+（y+2）²=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( ） 若3x-2y=0,则4x/x²-xy+y²=? （-3x^y+2xy)-( )=4x^+xy 若x+y=4,x^3+y^3=(x+y)(x^2-xy+y^2)z,求x^3+12xy+y^3的值. 若x+y=4,x-y=6,求xy(y^2+y)-y^2(xy+2x)-3xy的值. 若x+y=4 x-y=6 求xy(x^2+y)-y^2(xy+2x)-3xy的值求值 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 已知x/y=3/4 ,则3xy-2y/2x+4xy=? 若x-y/x+y=2,则x2+2xy+y2/4xy=多少 若(2x-14xy-2y)除以(x-2xy-y)=4,则1/x-1/y= 已知x-y=8 xy=7,则3xy-2x+2y+4(y-x)²=? 已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=? 已知x-y=-3,xy=2则3x-5y-(x-3y-4xy)是多少 已知1/X-1/Y=5 ,则x-2xy-y/4x+3xy-4y