已知x+1/2=y+3/4=x+y/5,求式子3x+2y+1/2x-y+3
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x+1/2=y+3/4=x+y/5,求式子3x+2y+1/2x-y+3
已知x-y=-3y+5,则式子x+2y-1的值是?
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知| x-3 | + | y-1/2 |=0,求式子3x+2y的值
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知3x-y=2x-3y+5,则式子x+2y-1的值是多少?
已知实数x,y满足条件|2x+3y+1|+(x+3y+5)²=0,求式子(-2xy)²×(-y
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知x、y的值满足等式(x+1)÷2=(y+3)÷4=(x+y)÷5,求式子(3x十2y十1)÷x十2y十3的值
已知3x-4y/2x+y=1/2 求x/y的值
已知4x=9y求(1)x+y/y (2)y-x/2x