已知z不等于0,x、y、z满足4x-7y-5x=0,2x-y-z=0.求x:y
问题描述:
已知z不等于0,x、y、z满足4x-7y-5x=0,2x-y-z=0.求x:y
答
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答
4x-7y-5x=0中5X是5Z吧
4x-7y-5Z=0 (1)
2x-y-z=0 (2)
要想求X:Y,先想办法把Z去掉,2x-y-z=0这个式子两边都X5,10X-5Y-5Z=0(3)
用(3)-(1)就变成3X+Y=0 X:Y=-1:3 看看对不对吧