当x=1 y=20;x=2 y=24;x=3 y=28;x=4 y=32;当x=n y=?
指数函数y=3^x当x
1、当(x+y)/(x-2y)=3时,2x/y=?
当2x-y/x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的值.
当2x-y\x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的値.
当x+y/x-y=1/2时,求代数式x-y/x+y-2x+2y/x-y的值
当x、y满足x>=0,y>=x,2x+y+k
当x=1/2,y=1/3时,求代数式x-(x+y)+(x+2y)-(x+3y)+…-(x+101y)的值
当x=1,y=-2时,代数式x-(x+y)+(x+2y)-(x+3y)+...-(x+99y)的值是多少
当2x-y/x+y=3时,求代数式2x-y/6x-3y的值
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6