作业帮已知x/3=y/4=z/5,求3x+2y-5z/x+y+z的值RT,
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已知x/3=y/4=z/5,求3x+2y-5z/x+y+z的值RT,
已知x/3=y/4=z/5,求3x+2y-5z/x+y+z的值
RT,
已知x/3=y/4=z/5,求3x+2y-5z/x+y+z的值RT,
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
x=3a,y=4a,z=5a;3x+2y-5z/x+y+z=9a+8a-25a/3a+4a+5a=8a/12a=2/3
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