观察下列各式: 12+1=2=1×2 22+2=6=2×3 32+3=12=3×4 42+4=20=4×5 试猜想992+99= ( )。
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,...[97%]
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,2,5,6,3,4,8,1D.4,1,2,6,8,5,9,3
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,...[97%]
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,2,5,6,3,4,8,1D.4,1,2,6,8,5,9,3
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,...[97%]
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,2,5,6,3,4,8,1D.4,1,2,6,8,5,9,3
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,...[97%]
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,2,5,6,3,4,8,1D.4,1,2,6,8,5,9,3
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,...[97%]
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,2,5,6,3,4,8,1D.4,1,2,6,8,5,9,3
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,...[97%]
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,2,5,6,3,4,8,1D.4,1,2,6,8,5,9,3
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,...[97%]
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,2,5,6,3,4,8,1D.4,1,2,6,8,5,9,3
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,...[97%]
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,2,5,6,3,4,8,1D.4,1,2,6,8,5,9,3
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,...[97%]
3,4,5,6,9,8,12A.2,3,6,5,4,1,8,9B.8,3,5,6,2,1,4,9C.9,2,5,6,3,4,8,1D.4,1,2,6,8,5,9,3