6x2+12x+10x2+2x+2=6(x2+2x+2)−2x2+2x+2=6−2x2+2x+2=6−2(x+1)2+1∵（x+1）2≥0，∴（x+1）2+1≥1，即1(x+1)2+1≤1，−2(x+1)2+1≥−2，6−2(x+1)2+1≥6−2=4，∴6x2+12x+10x2+2x+2可取的最小值为4．故选A．...