39,78 < 39,7..9..

hi

1+2+3+4+5+6+7+8+9+10+11+12+11+14+15+16+17+18+19+20

=(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(8+12)+(9+11)+(10+20)+(7+11)

=20+20+20+20+20+20+20+20+30+18

=20x8+30+18

=160+30+18

=190+18

=208

24 - 8 = 16

Khó thế cũng nghĩ ra hả bạn

Câu 1:

41 + 26 = 67

72 + 44 = 116

29 + 32 = 61

34 + 24 = 58

2

12-x=10

     x=12-10

     x=2

2

a: 2000/2021 < 1< 5/4

b: 1999/1998 > 1 > 79/80

c: 31/60 > 30/60 = 1/2 = 18/36 > 18/37

1 buy-some

2 dress

3 a

4 but

5 money