{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/10 11:47:49

3(x+y)-4(x-y)=4
(x+y)/2+(x-y)/6=1
令a=x+y,b=x-y
3a-4b=4 (1)
a/2+b/6=1
则3a+b=6 (2)
(2)-(1)
5b=2
b=2/5
a=(6-b)/3=28/15
x+y=28/15
x-y=2/5
相加
2x=34/15
x=17/15
y=28/15-x=11/15

{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 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 ｛4/(x+y)+6/(x-y)=3 ｛9/(x-y)-1/(x+y)=1 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 3分之2(X-Y)-4分之X+Y=-1,6(X+Y)-4(2X-Y)=16 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 一道二元一次方程组!3(x+y)-4(x-y)=4,(x+y)/2+(x-y)/6=1 解二元一次方程组{3(x+y)-4(x-y)=4,x+y/2+x-y/6=1 解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1