Question

1. tính nhanh:

                ( 1 - 3/4 ) x ( 1 - 3/7 ) x ( 1 - 3/10) x ( 1 - 3/13) x......x ( 1 - 3/97 ) x ( 1 - 100)

Answer 1

\(\left(1-\frac{3}{4}\right)x\left(1-\frac{3}{7}\right)x\left(1-\frac{3}{10}\right)x\left(1-\frac{3}{13}\right)x...x\left(1-\frac{3}{97}\right)x\left(1-\frac{3}{100}\right)\)

\(=\frac{1}{4}x\frac{4}{7}x\frac{7}{10}x\frac{10}{13}x...x\frac{94}{97}x\frac{97}{100}\)

\(=\frac{1}{100}\)

Answer 2

\(\left(1-\frac{3}{4}\right)\times\left(1-\frac{3}{7}\right)\times\left(1-\frac{3}{10}\right)...\times\left(1-\frac{3}{97}\right)\times\left(1-\frac{3}{100}\right)\)

\(=\frac{1}{4}\times\frac{4}{7}\times\frac{7}{10}\times...\times\frac{94}{97}\times\frac{97}{100}\)

\(=\frac{1\times4\times7\times10\times...\times97}{1\times4\times7\times10\times...\times97\times100}\)

\(=\frac{1}{100}\)

Answer 3

\(\frac{1}{4}\times\frac{4}{7}\times.....\times\frac{94}{97}\times\frac{97}{100}\)

\(=\frac{1\times4\times7\times.....\times97}{1\times4\times7\times.....\times97\times100}\)

\(=100\)