a) yes i do

b)i leave the home at 4:00

c)i go to school by bike

d)at 7 :00

e)at 11:15

f) i do my home work and go to bed

1-d

2-b

3-c

4-a

5-c

6-c

8-d

7-a

9-d

10-d

a = 198 vì 198 < 198,52

b = 199 vì 199 >198,52

Đáp số : a = 198   ;    b = 199

a) vi n chia het cho n nen n+5 chia het cho n khi 5 chia het cho n

do do n thuoc U(5)={1;5}

vay n=1 hoac n=5

xin loi nhe tu tu roi minh giai tiep nhe