3x-4y=0 x+y+z 若{7x=4z ,则————= x
1个回答
3x=4y
y=3x/4
7x=4z
z=7x/4
所以(x+y+z)/x
=(x+3x/4+7x/4)/x
=1+3/4+7/4
=7/2
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