解方程组:2x+y=15,2x-3y=-1
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解方程组:2x+y=15,2x-3y=-1
![解方程组:2x+y=15,2x-3y=-1](/uploads/image/z/18680299-43-9.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84%EF%BC%9A2x%2By%3D15%2C2x-3y%3D-1)
2x+y=15 (1),
2x-3y=-1 (2)
(1)-(2)
4y=16
y=4
代入(1)得
2x=15-4
x=5.5
2x-3y=-1 (2)
(1)-(2)
4y=16
y=4
代入(1)得
2x=15-4
x=5.5
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