已知5^x=2,5^y=3,求5^3x+2y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3x-2y/x+y=5/3求x；y的值 1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值 已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值 已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值 已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值. 已知X/Y=5/3,求X/(X+Y)+X/(X-Y)-Y*2/(X*2-Y*2)的值. 初二数学已知(x-y):y=2:3,求(2x+5y):(3x-y)的值 已知x-3y=0(y≠0)求2x+5y/3x-2y的值 已知1/x+1/y=5,求(2x-3y+2y)/(x+2xy+y)的值 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. (1)已知x+y=6,x²-y²=5,求x-y的值（2）若x+y=3,x²+y²