已知:4x-3y-6z=0,x+2y-7z=0,且x,y,z都不为零.求3x+2y+z/x+2y+3z的值.
已知:4x-3y-6z=0,x+2y-7z=0,且x,y,z都不为零.求
的值.
数学人气:520 ℃时间:2020-06-08 21:42:10
优质解答
解关于x、y的二元一次方程组
得
,
把x=3z,y=2z代入得原式=
=
.
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