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已知x/2=y/3=z/5,且2x+y-z=4,求式子x-3y+2z的值
人气:149 ℃ 时间:2020-02-04 03:40:06
解答
x/2=y/3=z/5=t
x=2t,y=3t,z=5t
2x+y-z=4
4t+3t-5t=4
2t=4
t=2
所以
x=4,y=6,z=10
x-3y+2z
=4-16+20
=8
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