Question

Bài 1: rút gọn các phân số

A) 31995-81/ 42660- 108

B) 7.2.7.5^2/ 14.2.5

C) 2^2 . 3^3 . 5/ 3.2^3.5^3

D) 5^3.90.4^3 / 25^2 . 3^2 . 2^13

E) 18.27+ 18.(-23)/ 34.4-4.52

F) 15^2.16^4-15^3.16^3/ 12^2.20^3-20^2.12^3

G) 2.3+4.6+14.21/3.5+6.10+21.35

Answer 1

A) 31995-81/ 42660- 108

= 31914/42552

= 3/4

B) 7.2.7.5²/ 14.2.5

= 14 . 7 . 25 / 140

= 98 . 25/140

= 2450/140

= 35/2

Answer 2

C) 2^2 . 3^3 . 5/ 3.2^3.5^3

= 4 . 27 . 5 / 3 . ( 2 . 5 )³

= 108 . 5 / 3. 10³

= 540 / 3000

= 9/50

Answer 3

f)\(\frac{15^2.16^4-15^3.16^3}{12^2.20^3-20^2+12^3}\)=\(\frac{15^2.16^3.\left(16-15\right)}{12^2.20^3.\left(20-12\right)}=\frac{15^2.16^3}{12^2.20^2.8}=\frac{1}{8}\)