1.(x+y)x(x+y)=121,已知x=7.5,求y=?
1.、已知线段x,y,如果(x+y):(x-y)=a:b,求x、y
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知x-y/x=x/x-2y(y不等于0),求x:y的值
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x,y为自然数,x>y且满足(x+y)+(x+xy-y)+x/y=243求x+y的值
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x=22/75,y=25/44,求(x+y)-(x-y)
已知2x+3y=2(x>0,y>0),求x+y最大值
已知2x+y=4,求代数式[(x+y)2-(x-y)2-2y(x-12
1.已知X:Y=5:2 求(X+Y):Y的值
已知:4x = 5y,求(x+y) :y