\(\dfrac{5}{7}\cdot\dfrac{6}{11}+\dfrac{5}{11}\cdot\dfrac{1}{7}-\dfrac{5}{7}\cdot\dfrac{14}{11}\)

\(=\dfrac{5}{7}\cdot\dfrac{6}{11}+\dfrac{5}{7}\cdot\dfrac{1}{11}-\dfrac{5}{7}\cdot\dfrac{14}{11}\)

\(=\dfrac{5}{7}\cdot\left(\dfrac{6}{11}+\dfrac{1}{11}-\dfrac{14}{11}\right)\)

\(=\dfrac{5}{7}\cdot\dfrac{-7}{11}=\dfrac{-5}{11}\)

\(-\frac{7}{11}.\frac{11}{19}+\frac{-7}{11}.\frac{8}{19}+\frac{-4}{11}=-\frac{7}{11}.\left(\frac{11}{19}+\frac{8}{19}\right)-\frac{4}{11}\)

\(=-\frac{7}{11}.1-\frac{4}{11}=-\frac{7}{11}-\frac{4}{11}\)

\(=-\frac{11}{11}=-1\)

`#3107.101107`

\(\dfrac{5}{7}\times\dfrac{6}{11}+\dfrac{5}{11}\times\dfrac{1}{7}-\dfrac{5}{7}\times\dfrac{14}{11}\\ =\dfrac{5}{7}\times\dfrac{6}{11}+\dfrac{5}{7}\times\dfrac{1}{11}-\dfrac{5}{7}\times\dfrac{14}{11}\\ =\dfrac{5}{7}\times\left(\dfrac{6}{11}+\dfrac{1}{11}-\dfrac{14}{11}\right)\\ =\dfrac{5}{7}\times\left(-\dfrac{7}{11}\right)\\ =-\dfrac{5}{11}\)

\(=\dfrac{11}{12}\left(\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{1}{7}\right)=\dfrac{11}{12}\cdot1=\dfrac{11}{12}\)

=11/12

11/12 nha

11.(6+7+7)

11.20=220

mak phát mi hok giỏi rứa bài ni mak pải hs thầy hùng biết cho mi chết

11*6+11*7+11*7=220

 11 x 6+11 x 7+11 x 7=11x(6+7+7)=11x20=220

`5/7xx5/11+5/7xx2/11-5/7xx14/11`

`=5/7xx(5/11+2/11-14/11)`

`=5/7xx(-7/11)`

`=-5/11`

\(\dfrac{5}{7}\times\dfrac{5}{11}+\dfrac{5}{7}\times\dfrac{2}{11}-\dfrac{5}{7}\times\dfrac{14}{11}\)

=\(\dfrac{5}{7}\times\left(\dfrac{5}{11}+\dfrac{2}{11}-\dfrac{14}{11}\right)\)

=\(\dfrac{5}{7}\)\(\times-\dfrac{7}{11}\)

=\(-\dfrac{5}{11}\)

Chúc bạn học tốt nhé

57×(511+211−1411)57×(511+211−1411)

=×−711×−711

=

a) = 1.1204
b) = 0.5714

a) = 1.1204
b) = 0.5714

a) = 1.1204
b) = 0.5714

11/7 + 7/21 = 11 x 3 / 7 x 3 + 7/21 = 33/21 + 7/21 = 40/21

\(\left(-\dfrac{3}{7}\right)\times\dfrac{5}{11}+\left(-\dfrac{3}{7}\right)\times\dfrac{6}{11}+2\times\dfrac{3}{7}\)

\(=\left(-\dfrac{3}{7}\right)\times\left(\dfrac{5}{11}+\dfrac{6}{11}-2\right)\)

\(=\left(-\dfrac{3}{7}\right)\times\left(1-2\right)\)

\(=\left(-\dfrac{3}{7}\right)\times\left(-1\right)\)

\(=\dfrac{3}{7}\)