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若x+2y+3z=10,4x+3y+2z=15,则x+y+z的值为()A.2B.3C.4D.5
题目详情
若x+2y+3z=10,4x+3y+2z=15,则x+y+z的值为( )
A. 2
B. 3
C. 4
D. 5
A. 2
B. 3
C. 4
D. 5
▼优质解答
答案和解析
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.
①+②,得:5(x+y+z)=25,即x+y+z=5;
故选D.
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