Question

tính nhanh

\(5\frac{2}{7}.\frac{8}{11}+5\frac{2}{7}.\frac{5}{11}-5\frac{2}{7}.\frac{2}{11}\)

\(\left(\frac{67}{111}+\frac{2}{33}-\frac{15}{117}\right).\left(\frac{1}{3}-\frac{1}{4}-\frac{1}{12}\right)\)

Answer 1

1) \(5\frac{2}{7}\).\(\frac{8}{11}\)+\(5\frac{2}{7}.\frac{5}{11}+5\frac{2}{7}.\frac{-2}{11}\)

= \(5\frac{2}{7}\).[\(\frac{8}{11}+\frac{5}{11}+\frac{-2}{11}\)]

= \(5\frac{2}{7}\).1

=\(5\frac{2}{7}\)

2)

Answer 2

5 2/7.8/9+5 2/7.5/11-5 2/7.2/11

=5 2/7.(8/11+5/11+2/11)

=5 2/7.15/11

=240/77.

(67/111+2/33-15/117).(1/3-1/4-1/12)

=811/1221.1/12

=811/14652