tu 92 den 99 co so cac so hang la:
(99-92)/1+1=8(so)
co so cac chu so la:
2*8=16(chu so)
tu 100 den 745 co so cac so hang la:
(745-100)/1+1=646(so)
co so cac chu so la:
646*3=1938(chu so)
=>Vay can so cac chu so la:
16+1938=1954(chu so)
tick nha co loi giai day du do