已知:x:y=3:2且x+y=10,求3xy的值

已知x^2=12,y^2=3,且|x-y|=y-x,求x+y的值. 已知:x:y=3:2且x+y=10,求3xy的值 已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y 已知2x-y/7x+5y=2/3且y≠0,求x/y的值 (x+y)(x+y-10)+25=0,且x-y=3,求x,y (x+y)(x+y-10)+25=0,且x-y=3,求x,y 已知x:y=3:1,且x+y=12,求x-y的值. 已知|x|=3,|y|=4,且x＞y,求x.y的值. 已知|x|=3,x+y=0,且x-y>0,求|x+2|-(y-3)²的值. 已知|x|=3,x+y=0且x-y>0,求|x+2|-(y-3)² 的值 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知（y-5)^0=1无意义,且3x+2y=10,求x,y的值 已知:x>0,y>0,且x- 10√xy+25y=0,求2x+√xy+3y/x+√xy-y 已知x、y均为实数,且满足xy+x+y=17,x^2y+y^2x=66,求x^4+x^3y+x^2*y^2+y^3x+y^4的值 已知（x+y）(x+y-10)+25=0,且x-y=2,求x,y的值? 已知x,y属于R+,且2x+8y-xy=0,求x+y的最小值.2.已知x,y属于R+,且x+2y=3,求[1/(x+2)]+[1/2(y+1)]的最小值 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y²