已知2y-x/7x+5y=2/3且y≠0,求x/y的值
已知2y-x/7x+5y=2/3且y≠0,求x/y的值
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知x:y=2:3,且二分之2x+y-1,求x、y的值
已知xyz≠0,且x+3y+z=0,2x+3y-z=0 ,求x+2y-7z /3x+5y+z的值?
已知X、Y满足2X-7Y=3M,X+2Y=4m+5,且X+Y=0,求M的值
已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.
已知x,y是有理数,且满足|3-x|+|y-15|=0,求3x+2y的值?
已知5x-4y=0且xy不等于0,求x^2+y^2/x^2-y^2-x+y/x-y的值
已知x^2+y^2=25,x+y=7,且x小于y求x-y的值
已知x-3y=0(y≠0)求2x+5y/3x-2y的值
已知x^2=12,y^2=3,且|x-y|=y-x,求x+y的值.
已知4x-3y-6z=0,x+2y-7z=0,且x,y,z≠0,求2x+3y+6z/x+5y+5z的值.