Question

Tính :

a) 6 x 7 x 8 / 8 x 9 x 10

b) 7 / 8 x 9 / 11 x 8 / 3 : 2 / 9

Answer 1

a,\(\frac{6\times7\times8}{8\times9\times10}=\frac{6\times7}{9\times10}=\frac{7}{15}\)

Answer 2

\(\frac{7}{8}.\frac{9}{11}.\frac{8}{3}:\frac{2}{9}\)

\(=\frac{7.9.8.9}{8.11.3.2}\)

\(=\frac{189}{11}\)

Dấu \(\left(.\right)\)là dấu nhân nhé

Answer 3

\(\frac{6\times7\times8}{8\times9\times10}\)

\(=\frac{6\times7}{9\times10}\)

\(=\frac{42}{90}=\frac{7}{15}\)

Answer 4

\(\frac{6\times7\times8}{8\times9\times10}\)

\(=\frac{2\times3\times7\times8}{8\times3\times3\times2\times5}\)

\(=\frac{7}{15}\)

\(\frac{7}{8}\times\frac{9}{11}\times\frac{8}{3}:\frac{2}{9}\)

\(=\frac{63}{88}\times\frac{8}{3}\times\frac{9}{2}\)

\(=\frac{63}{88}\times12\)

\(=\frac{189}{11}\)