已知2x+y-8z=0,3x-y-7z=0,求2x+3y-2z/x-2y+3z的值
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已知2x+y-8z=0,3x-y-7z=0,求2x+3y-2z/x-2y+3z的值
已知2x+y-8z=0,3x-y-7z=0,求2x+3y-2z/x-2y+3z的值
已知2x+y-8z=0,3x-y-7z=0,求2x+3y-2z/x-2y+3z的值
2x+y-8z=0 (1)
3x-y-7z=0 (2)
(1)+(2)
5x-15z=0
x=3z
代入(1)
6z+y-8z=0
y-2z=0
y=2z
x=3z,y=2z代入分式:
(2x+3y-2z)/(x-2y+3z)
=(6z+6z-2z)/(3z-4z+3z)
=10/2
=5
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