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数学
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若{3x-4y=0,5x=4z,则x分之x+y+z=?
人气:318 ℃ 时间:2020-02-05 17:26:16
解答
3x-4y=0 所以y = 3x/ 4
5x=4z所以z = 5x / 4
x分之x+y+z =(x + 3x/ 4+ 5x / 4 )/ x
= 3x / x
= 3
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