69 , 00 - 7 , 85 61 , 15

Em tự đặt tính nhé     69:3=23     86:2=43

69; 3 = 23

86; 2 = 43

tự đặt tính đi nhá:

69:3=23.

86:2=43.

13 : 4 = 3,25

69 : 12 = 5,75

135 : 36 = 3,75

13 : 4=3,25

69 : 12=5,75/135:36=3,75

7895:83=95(dư 10)

9785:79=123(dư 68)

5873:57=103(dư 2)

4567:69=66(dư 13)

a) Đặt tính rồi tính ta có:

\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{12}\\{\,\,8}\end{array}}\\\hline{\,\,\,20}\end{array}\)                                       \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{33}\\{\,\,7}\end{array}}\\\hline{\,\,\,40}\end{array}\)

\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{65}\\{\,\,5}\end{array}}\\\hline{\,\,\,70}\end{array}\)                                       \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{84}\\{\,\,6}\end{array}}\\\hline{\,\,\,90}\end{array}\)

Vậy ta có kết quả như sau:

b)

\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{35}\\{\,\,\,5}\end{array}}\\\hline{\,\,\,\,40}\end{array}\)                                       \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{69}\\{\,\,\,4}\end{array}}\\\hline{\,\,\,\,73}\end{array}\)

\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{19}\\{\,\,\,3}\end{array}}\\\hline{\,\,\,\,22}\end{array}\)                                       \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{29}\\{\,\,\,6}\end{array}}\\\hline{\,\,\,\,35}\end{array}\)

69:12=5,75

23:4=5,75

15:8=1,875

3:4=0,75

2:5=0,4