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数学
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若x+2y+3z=10,4x+3y+2z=15,则x+y+z的值为( )
A. 2
B. 3
C. 4
D. 5
人气:247 ℃ 时间:2019-10-24 14:10:56
解答
由题意,x+2y+3z=10①,4x+3y+2z=15②,
①+②,得:5(x+y+z)=25,即x+y+z=5;
故选D.
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