Toán lớp 6. Tính nhanh các giá trị biểu thức:

Question

A = 1²/1.2 x 2²/2.3 x 3²/3.4 x 4²/4.5 

B = 2²/1.3 x 3²/2.4 x 4²/3.5 x 5²/4.6

Answer 1

A = 1/5

B = 5/3

Answer 2

A = 1²/1.2 x 2²/2.3 x 3²/3.4 x 4²/4.5 
A = 1.1.2.2.3.3.4.4/1.2.2.3.3.4.4.5

A = 1.1.1.1.1.1.1.1/1.1.1.1.1.1.1.5

A = 1/5

B = 2²/1.3 x 3²/2.4 x 4²/3.5 x 5²/4.6

B = 2.2.3.3.4.4.5.5/1.3.2.4.3.5.4.6

B = 2.1.1.1.1.1.1.5/1.1.1.1.1.1.1.6

B = 10/6

B = 5/3