(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=－2 0 求x,y分可以加.
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(x+y)/2+(x-y)/3=64(x+y)-3(x-y)=－20求x,y分可以加.(x+y)/2+(x-y)/3=64(x+y)-3(x-y)=－20求x,y分可以加.(x+y)/2+(x-y)/
(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=－2 0 求x,y分可以加.
(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=－2 0 求x,y
分可以加.
(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=－2 0 求x,y分可以加.
化简方程(x+y)/2+(x-y)/3=6可得5X+Y=36 --A
化简方程4(x+y)-3(x-y)=-20可得X+7Y=-20 --B
B*5:5X+35Y=-100
B*5-A:34Y=-136 => Y=-4,将Y=-4代入A式中可得：
5X-4=36 => X=8
所以此方程的解是X=8,Y=-4
x=8,y=-4
由题意得: 1/2x+1/2y+1/3x-1/3y=-20①
64x+64y-3x+3y=-20②
然后自己去解
x=8 y=-4
你的题有问题，6和4之间有空格，还是就是64？
{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
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
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