解:设2V+N+B=60 ------(1)2H+B+N=32 ------(2)2V+N+H=66 ------(3)2H+V+B=40 ------ (4)(3)-(1)得: H - B = 6 ------(5)(4)- (2)得:V - N = 8 ------(6)(1)-(2)得:V - H = 14 ------(7)将(7)-(6)得:N - H = 6 ,则 H = N - 6 ------(8) 将 (8)代入(4)得:2(N - 6)+ V + B = 40去括号得: 2N - 12 + V + B = 40移项、合并、整理得: 2N + B + V = 52, 即为所求。 求:2N+B+V=?