\(\frac{8}{3}\)NHỚ K NHÉ

mk nghĩ kết quả = \(\frac{8}{3}\)

nếu đúng thì tk mk nha

Bằng 1

\(\frac{21}{11}\cdot\frac{22}{17}\cdot\frac{68}{63}\)

\(=\frac{1}{1}\cdot\frac{2}{1}\cdot\frac{4}{3}\)

\(=\frac{8}{3}\)

a)\(\frac{21}{11}x\frac{22}{17}x\frac{68}{63}\)

=\(\frac{21x22x68}{11x17x63}\)

=\(\frac{21x11x2x17x4}{11x17x21x3}\)

=\(\frac{2x4}{3}\)

=\(\frac{8}{3}\)

b)\(\frac{5}{14}x\frac{7}{13}x\frac{26}{25}\)

=\(\frac{5x7x26}{14x13x25}\)

a) \(\frac{21\times11\times2\times17\times4}{11\times17\times21\times3}=\frac{2\times4}{3}_{ }=\frac{8}{3}\)

b)\(\frac{5\times7\times13\times2}{7\times2\times13\times5\times5}=\frac{1}{5}\)

a)\(\frac{21x22x68}{11x17x63}\) = \(\frac{1x2x4}{1x1x3}\) =\(\frac{8}{3}\)

b)\(\frac{5x7x26}{14x13x25}\) = \(\frac{1x1x2}{2x1x5}\) =\(\frac{1x1x1}{1x1x5}\) = \(\frac{1}{5}\) 

\(\frac{21}{63}.\frac{22}{11}.\frac{68}{17}=\frac{8}{3}\)

\(\frac{5}{25}.\frac{7}{14}.\frac{26}{13}=\frac{1}{5}\)

trong SGK có mà bạn 

a) 11x2x17x4x21/11x17x63=8/3

b)5x7x13x2/2x7x13x5x5=1/5

\(\frac{3}{4}\cdot\frac{15}{17}+\frac{3}{4}\cdot\frac{2}{17}+\frac{1}{17}\)

\(=\frac{3}{4}\cdot\left(\frac{15}{17}+\frac{2}{17}\right)+\frac{1}{17}\)

\(=\frac{3}{4}\cdot1+\frac{1}{17}\)

\(=\frac{5}{8}\)

\(\frac{3}{4}.\frac{15}{17}+\frac{3}{4}.\frac{2}{17}+\frac{1}{17}\)

=\(\frac{3}{4}.\left(\frac{15}{17}+\frac{2}{17}\right)+\frac{1}{17}\)

=\(\frac{3}{4}.1+\frac{1}{17}\)

=\(\frac{51}{68}+\frac{4}{68}=\frac{55}{68}\)

a) (21x11x2x17x4)/(11x17x21x3)

=(21x11x2x17x4)/(11x17x21x3)

=8/3

b) (5x7x13x2)/(7x2x13x5x5)

=1/5