x-y=3 3x-8y14和3x+4y=16 5x-6y=33
x-y=3 3x-8y14和3x+4y=16 5x-6y=33
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
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
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
5x=y,5:y=x,3x=4y,3:x=4:y,3;x=y:4,3x+4x=y,3x+4=y y和x成比例吗