B
5 tuổi
77 giờ
(35+x)−12=27
⇒35+x=27+12
⇒35+x=39
⇒x=39−35
⇒x=4
D
137 x ( 13 - 3 ) = 137 x 10 = 1370
won't rain
won't come
A
C
B
D
A
C
B
A
A
C
B
C
A
D
C
A
B
B
B
D
C
A
C
D
C
C
C