ƯCLN (a,b)=b

Chúc bạn học tốt

Bài 1

a) 3 2/5 - 1/2

= 17/5 - 1/2

= 34/10 - 5/10

= 29/10

b) 4/5 + 1/5 × 3/4

= 4/5 + 3/20

= 16/20 + 3/20

= 19/20

c) 3 1/2 × 1 1/7

= 7/2 × 8/7

= 4

d) 4 1/6 : 2 1/3

= 25/6 : 7/3

= 25/14

tổng số phần bằng nhau là 

5+1=6

tuổi mẹ là:

24:6 x 5= 20( tuổi)

tuổi con là:

24-20=4( tuổi)

        Vậy mẹ: 20 tuổi

                    con: 4 tuổi

3.x - 2⁴.7³ = 2.7⁶

3x - 16.343 = 2.117649

3x - 5488 = 235298

3x = 235298 + 5488

3x = 240786

x = 240796 : 3

x = 80262

Vậy....

Bài 1

a) 3 2/5 - 1/2

= 17/5 - 1/2

= 34/10 - 5/10

= 29/10

b) 4/5 + 1/5 × 3/4

= 4/5 + 3/20

= 16/20 + 3/20

= 19/20

c) 3 1/2 × 1 1/7

= 7/2 × 8/7

= 4

d) 4 1/6 : 2 1/3

= 25/6 : 7/3

= 25/14

bủh

sai đề (maybe)

3. prettier

4. thinner

5. more important

6. happier

7. worse

8. better

9. more polluted

10. more challenging

c

2 Jack drives more carelessly than him

3 That film is more boring than this one

4 Yesterday is warmer than today

5 I am younger than my brother

bủh