{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/04 16:52:39

{(x+y)/2+(x-y)/3=6
3(x+y)+2(x-y)=36 (1)
4(x+y)-3(x-y)=-20 (2)
由（1）*3+(2)*2得
9(x+y)+6(x-y)+8(x+y)-6(x-y)=36*3+2*（-20）
17(x+y)=68
x+y=4 （3）
将（3）代入(1）得
3*4+2(x-y)=36
x-y=12 (4)
由（3）+(4)得
x=8
y=-4

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 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= ｛4/(x+y)+6/(x-y)=3 ｛9/(x-y)-1/(x+y)=1 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 (x+y)(x+2y)(x+3y)(x+4y)=-40 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)