1/5+10+1/20+1/40. Về

2 bình luận về “1/5+10+1/20+1/40. Về”

1. 1/5+10+1/20+1/40

   =8/40+400/40+2/40+1/40

   =408/40+2/40+1/40

   =410/40+1/40

   =411/40

   Trả lời
2. Các bước làm:

   = (1/5 +1/20+1/40) +10

   = ( 8/40 + 2/40 +1/40 ) +10

   = 11 /40 + 10

   = 411/40

    

   Trả lời