Question

Tính:a) (2^10 . 3^10 - 2^10 . 3^9) : (2^9 . 3^10)

b) (11. 3^22. 3^7- 9^15) :(2. 3^14) ^2

c)(5^11. 7^12+ 5^11. 7^11) :( 5^12. 7^11+ 9. 5^11.7^11)

Giải hộ với ạ. Cần gấp

Answer 1

a) (2¹⁰.3¹⁰ - 2¹⁰.3⁹) : (2⁹.3¹⁰)

= [2¹⁰.3⁹.(3 - 2)] : (2⁹.3¹⁰)

= (2¹⁰.3⁹) : (2⁹.3¹⁰)

= 2/3

b) (11.3²².3⁷ - 9¹⁵) : (2.3¹⁴)²

= [11.3²⁹ - (3²)¹⁵] : (2².3²⁸)

= (11.3²⁹ - 3³⁰) : (4.3²⁸)

= [3²⁹.(11 - 3)] : (4.3²⁸)

= (3²⁹.8) : (4.3²⁸)

= 3.2

= 6

c) (5¹¹.7¹² + 5¹¹.7¹¹) : (5¹².7¹¹ + 9.5¹¹.7¹¹)

= [5¹¹.7¹¹(7 + 1)] : [5¹¹.7¹¹(1 + 9)]

= (8.5¹¹.7¹¹) : (10.5¹¹.7¹¹)

= 4/5