Question

\(\frac{2^2}{1\cdot3}\)x \(\frac{3^2}{2\cdot4}\) x \(\frac{4^2}{3\cdot5}\)x \(\frac{5^2}{4\cdot6}\)x \(\frac{6^2}{5\cdot7}\)

Answer 1

\(\frac{2.2}{1.3}x\frac{3.3}{2.4}x\frac{4.4}{3.5}x\frac{5.5}{4.6}x\frac{6.6}{5.7}\)=\(2.\frac{2}{3}.\frac{3}{2}.\frac{3}{4}.\frac{4}{3}.\frac{4}{5}.\frac{5}{4}.\frac{5}{6}.\frac{6}{5}.\frac{6}{7}\)

                                                      \(=2.\frac{6}{7}=\frac{12}{7}\)

Answer 2

2²/1.3 × 3²/2.4 × 4²/3.5 × 5²/4.6 × 6²/5.7

= 2.3.4.5.6/1.2.3.4.5 × 2.3.4.5.6/3.4.5.6.7

= 6 × 2/7

= 12/7

Answer 3

\(\frac{2^2}{1.2}\times\frac{3^2}{2.3}\times\frac{4^2}{3.4}\times\frac{5^2}{4.5}\times\frac{6^2}{5.6}\)

=2x6

=12 nha bạn