x+5y=6 3x-6y=4
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x+5y=6 3x-6y=4
![x+5y=6 3x-6y=4](/uploads/image/z/15291381-21-1.jpg?t=x%2B5y%3D6+3x-6y%3D4)
{x+5y=6 (1)
3x-6y=4 (2)
(1)×3得 3x+15y=18 (3)
(3)-(2)得 21y=14
y=2/3
y=2/3代入(1)得 x+10/3=6
x=8/3
∴{x=8/3,y=2/3是原方程组 的解
再问: 回答的真好
3x-6y=4 (2)
(1)×3得 3x+15y=18 (3)
(3)-(2)得 21y=14
y=2/3
y=2/3代入(1)得 x+10/3=6
x=8/3
∴{x=8/3,y=2/3是原方程组 的解
再问: 回答的真好
{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
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
4x-2y-6y*-y-3x+5y* *=2 就是平方
若5x+3y=3x+4y=x+2y+6,则x+y=___
x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组
解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2