[单选题]设(3(alpha_{1}-alpha)+2(alpha_{2}+alpha)=5(alpha_{3}+alpha),)试求向量`alpha=`_____，其中`alpha_{1}=(2,5,1,3)^{T},alpha_{2}=(10,1,5,10)^{T}`，(alpha_{3}=(4,1,-1,1)^{T}。)
[单选题]intmain(){inta[][3]={1,4,7,2,5,8,3,6,9};inti,j,k=2;for(i=0;i<3;i++)printf("%d",a[k][i]);return0;}程序的输出结果是
