(1) (10n+4)*(10n+6)=100*n*(n+1)+24 (n>=0)
(2) 124*126=100*12*13+24=15624
(3) 能.如
(10n+2)*(10n+8)=100*n*(n+1)+16 (n>=0)
即:2*8=16
12*18=216
22*28=616
32*38=1216
.
(1) (10n+4)*(10n+6)=100*n*(n+1)+24 (n>=0)
(2) 124*126=100*12*13+24=15624
(3) 能.如
(10n+2)*(10n+8)=100*n*(n+1)+16 (n>=0)
即:2*8=16
12*18=216
22*28=616
32*38=1216
.