3x+4y=84 4x+3y=84
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3x+4y=84 4x+3y=84
![3x+4y=84 4x+3y=84](/uploads/image/z/12811776-24-6.jpg?t=3x%2B4y%3D84+4x%2B3y%3D84)
3x+4y=84 (1)
4x+3y=84 (2)
(1)+(2)得7x+7y=168 x+y=24 3x+3y=72 (4) 4x+4y=96 (5)
(2)-(4)得x=12 (5)-(1)得y=12
x=12
y=12
4x+3y=84 (2)
(1)+(2)得7x+7y=168 x+y=24 3x+3y=72 (4) 4x+4y=96 (5)
(2)-(4)得x=12 (5)-(1)得y=12
x=12
y=12
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
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)=11,2(x-y)+5(x+y)=27
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
(x+y)(x+2y)(x+3y)(x+4y)=-40
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