x+2y=16 2x+y=3x-y还有2个问题 呵呵7x-3y=1 4x-5y=-1710x+3y+1=0 4x+5y+8=0
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x+2y=162x+y=3x-y还有2个问题呵呵7x-3y=14x-5y=-1710x+3y+1=04x+5y+8=0x+2y=162x+y=3x-y还有2个问题呵呵7x-3y=14x-5y=-171
x+2y=16 2x+y=3x-y还有2个问题 呵呵7x-3y=1 4x-5y=-1710x+3y+1=0 4x+5y+8=0
x+2y=16 2x+y=3x-y
还有2个问题 呵呵
7x-3y=1 4x-5y=-17
10x+3y+1=0 4x+5y+8=0
x+2y=16 2x+y=3x-y还有2个问题 呵呵7x-3y=1 4x-5y=-1710x+3y+1=0 4x+5y+8=0
x+2y=16 (1)
2x+y=3x-y
即x=2y
代入(1)
2y+2y=16
4y=16
y=4
x=2y=8
x=16-2y代入2y=x
2y=16-2y
y=4
x=8
x+2y=16 =》 x = 16-2y
2x+y=3x-y =》 x = 2y
=> 16-2y=2y
y = 4, x = 8
x+2y=16 2x+y=3x-y
x=16-2y 2x-3x=-y-y
-x=-2y
x=2y
16-2y=2y y=4
x=8
x+2y=16
2x+y=3x-y合并同类项后x=2y代入上式
2x=16
x=8
y=4
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