2x/3+3y/4=17/12 x/6-y/2=-1/3
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2x/3+3y/4=17/12x/6-y/2=-1/32x/3+3y/4=17/12x/6-y/2=-1/32x/3+3y/4=17/12x/6-y/2=-1/3原式化整:8x+9y=17.(1)x-
2x/3+3y/4=17/12 x/6-y/2=-1/3
2x/3+3y/4=17/12 x/6-y/2=-1/3
2x/3+3y/4=17/12 x/6-y/2=-1/3
原式化整:8x+9y=17.(1)
x-3y= -2 .(2)
解方程组消去Y,(2)*3+(1)
11x=11
x=1
将x=1代入(2)式
1-3y= -2
y=1
得解x=1
y=1
解由2x/3+3y/4=17/12 得8x+9y=17......1
由x/6-y/2=-1/3得 x-3y=-2.........2
由2×3+1得x=1,
即把x=1代入2,得y=1
即x=1,y=1
2x/3+3y/4=17/12 同乘12得8x+9y=17(1)
x/6-y/2=-1/3同乘18得3x-9y=-6(2)
(1)+(2)得11x=11,即x=1
代入得y=1
即方程组解为x=1,y=1
x=1
y=1
①2x/3+3y/4=17/12
②x/6-y/2=-1/3
将①扩大12倍,得③8x+9y=17
将②扩大6倍,得④x=3y-2
将④代入③,得8(3y-2)+9y=17,y=1
将y=1代入④,得x=3×1-2,x=1
x=1,y=1
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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
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