Question

b,(1-1/49)x(1-1/64)x(1-1/81)x(1-1/100)x(1-1/121)x(1-1/144)

Answer 1

13/14

còn cách làm thì hổng biết

Answer 2

mình có cách làm rồi chờ tí nhé

Answer 3

\(\left(1-\frac{1}{49}\right)\left(1-\frac{1}{64}\right)\left(1-\frac{1}{81}\right)\left(1-\frac{1}{100}\right)\left(1-\frac{1}{21}\right)\left(1-\frac{1}{144}\right)\)

\(=\frac{48}{49}.\frac{63}{64}.\frac{80}{81}.\frac{99}{100}.\frac{120}{121}.\frac{144}{143}\)

\(=\frac{48.63.80.99.120.143}{49.64.81.100.121.144}\)

\(=\frac{6.8.7.9.8.10.11.9.20.6.13.11}{7.7.8.8.9.9.10.10.11.11.6.2.6.2}\)

\(=\frac{13}{14}\)

 

 

Answer 4

haizzzz dù gi cung cam on bn

Answer 5

thanks