\(\frac{1}{4}.\frac{15}{49}-\left(\frac{4}{5}+\frac{2}{3}\right)\div3\frac{2}{3}\)

\(=\frac{15}{196}-\left(\frac{12}{15}+\frac{10}{15}\right)\div\frac{11}{3}\)

\(=\frac{15}{196}-\left(\frac{12}{15}+\frac{10}{15}\right).\frac{3}{11}\)

\(=\frac{15}{196}-\frac{22}{15}.\frac{3}{11}\)

\(=\frac{15}{196}-\frac{2}{5}.\frac{1}{1}\)

\(=\frac{15}{196}-\frac{2}{5}\)

\(=\frac{75}{980}-\frac{392}{980}=\frac{-317}{980}\)

\(\frac{1}{4}\cdot\frac{15}{49}-\left(\frac{4}{5}+\frac{2}{3}\right):3\frac{2}{3}\)

\(=\frac{15}{196}-\frac{22}{15}\cdot\frac{3}{11}\)

\(=\frac{15}{196}-\frac{2}{5}\)

\(=-\frac{317}{980}\)

bạn trg nào

\(\frac{-7}{12}+\frac{11}{8}-\frac{5}{9}\)

\(=\frac{-42}{72}+\frac{99}{72}+\frac{-40}{72}\)

\(=\frac{17}{72}\)

sorry, i can't anwer your question.

1 ) 5/4 + 1/6 : 7/9

= 5/4 + 1/6 . 9/7

= 5/4 + 1 . 9 / 6 . 7

= 5/4 + 3/14

= 35/28 + 6/28

= 41/28

                 #Cothanhkhe

2) -1,6  : ( 1 + 2/3 )

= -16/10 : ( 3/3 + 2/3 )

= -8/5 : 3 + 2 /3

= -8/5 : 5/3

= -8/5 . 3/5

= -8 . 3 / 5 . 5

= -24/25

                    #Cothanhkhe

a:41/26

A=-1/10

B câu b có và 1/5 là sao pn

Ta có :

\(1,4.\dfrac{15}{49}-\left(20\%+\dfrac{2}{3}\right):\dfrac{11}{5}\)

\(=\dfrac{14}{10}.\dfrac{15}{49}-\left(\dfrac{20}{100}+\dfrac{2}{3}\right).\dfrac{5}{11}\)

\(=\dfrac{7}{5}.\dfrac{15}{49}-\left(\dfrac{1}{5}+\dfrac{2}{3}\right).\dfrac{5}{11}\)

\(=\dfrac{3}{7}-\dfrac{13}{15}.\dfrac{5}{11}\)

\(=\dfrac{3}{7}-\dfrac{13}{33}=\dfrac{8}{231}\)

~ Học tốt ~

\(1.4\times\dfrac{15}{49}-\left(20\%+\dfrac{2}{3}\right):\dfrac{11}{5}\)

\(=\dfrac{7}{5}\times\dfrac{15}{49}-\left(\dfrac{1}{5}+\dfrac{2}{3}\right):\dfrac{11}{5}\)

\(=\dfrac{3}{7}-\dfrac{13}{15}:\dfrac{11}{15}\)

\(=\dfrac{3}{7}-\dfrac{11}{5}=\dfrac{13}{33}\)

​/ là phân số

1.=6/7.8/13+6/7.9/13-3/13.6/7=6/7.(8/13+9/13-3/13)=6/7.14/13=12/13

\(=\frac{8}{231}\)

8/231 nha k mình nhé