y=3^x+3^(-x)（x=/0)的值域

已知|3x-y|+|x+y|=0,求x-y除以x*y的值. 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 x/3=y/4,求(x*x-xy)/(x*x+y*y)的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 y=3(x-y),x=2(x-y)求x,y的值 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是（）?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8？(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8 已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值 化简求值：已知x、y满足：x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y)-(x-3y)(x+3y)急用！ 化简求值:已知x、y,满足:x²+y²-4x+6y+13=0求代数式（3x+y)²-3（3x-y)(x+y)-(x-3y)(x+3y)的值 已知x(x-1)-(x²+y)=3 求x(x-y)+(y-x)的值 已知x-y=3 ,(x+y）（x+y+10)+25=0 求x,y的值 (x+y）（x+y+10)+25=0 x-y=3 求x,y的值 若有理数x.y.z满足等式(x-2)*(x-2)+(2x-y)*(2x-y)*(2x-y)*(2x-y)*+|x-3z|=0,求x+y+z的值 已知x*x+y*y-4x-6y+13=0,求3x+4y的值 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值.