{y=2x-7{5x+3y+2z=2{3x-4z=4
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{y=2x-7{5x+3y+2z=2{3x-4z=4
![{y=2x-7{5x+3y+2z=2{3x-4z=4](/uploads/image/z/13340941-61-1.jpg?t=%7By%3D2x-7%7B5x%2B3y%2B2z%3D2%7B3x-4z%3D4)
y=2x-7(1)
5x+3y+2z=2(2)
3x-4z=4(3)
由(2)*2+(3)得13x+6y=8(4)
由(1)代入(4)得
13x+6(2x-7)=8
即25x=50,解得x=2
代入(1)得y=-3
代入(3)得z=0.5
方程组解为x=2,y=-3,z=0.5
5x+3y+2z=2(2)
3x-4z=4(3)
由(2)*2+(3)得13x+6y=8(4)
由(1)代入(4)得
13x+6(2x-7)=8
即25x=50,解得x=2
代入(1)得y=-3
代入(3)得z=0.5
方程组解为x=2,y=-3,z=0.5
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