Giải bài tập 9 trang 20 sách toán tiếng anh 4.
a. What is the greatest number in all 6-digit numbers? 999 999
b. What is the greatest number in all 7-digit numbers? 9 999 999
c. What is the greatest number in all 8-digit numbers? 99 999 999
d. What is the smallest number in all 8-digit numbers? 10 000 000
e. What is the smallest number in all 9-digit numbers? 100 000 000
f. What is the smallest number in all 10-digit numbers? 1 000 000 000