已知:4x-3y-6z=0,x+2y-7z=0,求2x+3y+6z/x+5y+7z的值
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已知:4x-3y-6z=0,x+2y-7z=0,求2x+3y+6z/x+5y+7z的值
已知:4x-3y-6z=0,x+2y-7z=0,求2x+3y+6z/x+5y+7z的值
已知:4x-3y-6z=0,x+2y-7z=0,求2x+3y+6z/x+5y+7z的值
将4x-3y-6z=0,x+2y-7z=0移项转化成以下方程组:
4x-3y=6z,
x+2y=7z
解得:x=3z,y=2z
(2x+3y+6z)/(x+5y+7z)
=(6z+6z+6z)/(3z+10z+7z)
=9/10