若3x-2y=13及4x+4x+3y=6,求2x-y的值

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若3x-2y=13及4x+4x+3y=6,求2x-y的值
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1

{3(x+y)-4(x-y)=4{x+y/2+x-y/6=1{3(x+y)-4(x-y)=4{x+y/2+x-y/6=1{3(x+y)-4(x-y)=4{x+y/2+x-y/6=13(x+y)-4(x-y)=4(x+y)/2+(x-y)/6

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)=-20x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20由(1)得3x+3y+2x-2y=365x+y=36(

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

{(x+y)/2+(x-y)/3=64(x+y)-3(x-y)=-20{(x+y)/2+(x-y)/3=64(x+y)-3(x-y)=-20{(x+y)/2+(x-y)/3=64(x+y)-3(x-y)=-20{(x+y)/2+(x-y)/

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

4(x+y)-3(x-y)=-20,2/x+y+3/x-y=64(x+y)-3(x-y)=-20,2/x+y+3/x-y=64(x+y)-3(x-y)=-20,2/x+y+3/x-y=6第二个方程是不是写错了2/(x+y)+3/(x-y)=

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

(x+y)/2-x-y/2=63(x+y)=4(x-y)(x+y)/2-x-y/2=63(x+y)=4(x-y)(x+y)/2-x-y/2=63(x+y)=4(x-y)(x+y)/2-(x-y)/2=6两边同乘以2,x+y-x+y=122y

x+y/3+x-y/2=6 4(x+y)-2(x-y)=40

x+y/3+x-y/2=64(x+y)-2(x-y)=40x+y/3+x-y/2=64(x+y)-2(x-y)=40x+y/3+x-y/2=64(x+y)-2(x-y)=40答:(x+y)/3+(x-y)/2=64(x+y)-2(x-y)=

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