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已知x/3=y/4=z/5,求3x+2y-5z/x+y+z的值
RT,
人气:100 ℃ 时间:2020-03-23 03:35:46
解答
x/3=y/4=z/5=t
x=3t y=4t z=5t
代入:(3x+2y-5z)/(x+y+z)
(3*3t+2*4t-5*5t)/(3t+4t+5t)
=(-8t)/(12t)
=-2/3
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