- 1,4.15/49-(4/5+2/3):2.1/5
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\(\frac{1}{4}.\frac{15}{49}-\left(\frac{4}{5}+\frac{2}{3}\right)\div3\frac{2}{3}\)
\(=\frac{15}{196}-\left(\frac{12}{15}+\frac{10}{15}\right)\div\frac{11}{3}\)
\(=\frac{15}{196}-\left(\frac{12}{15}+\frac{10}{15}\right).\frac{3}{11}\)
\(=\frac{15}{196}-\frac{22}{15}.\frac{3}{11}\)
\(=\frac{15}{196}-\frac{2}{5}.\frac{1}{1}\)
\(=\frac{15}{196}-\frac{2}{5}\)
\(=\frac{75}{980}-\frac{392}{980}=\frac{-317}{980}\)
\(\frac{1}{4}\cdot\frac{15}{49}-\left(\frac{4}{5}+\frac{2}{3}\right):3\frac{2}{3}\)
\(=\frac{15}{196}-\frac{22}{15}\cdot\frac{3}{11}\)
\(=\frac{15}{196}-\frac{2}{5}\)
\(=-\frac{317}{980}\)
\(\frac{-7}{12}+\frac{11}{8}-\frac{5}{9}\)
\(=\frac{-42}{72}+\frac{99}{72}+\frac{-40}{72}\)
\(=\frac{17}{72}\)
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
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 ~
\(1.4\times\dfrac{15}{49}-\left(20\%+\dfrac{2}{3}\right):\dfrac{11}{5}\)
\(=\dfrac{7}{5}\times\dfrac{15}{49}-\left(\dfrac{1}{5}+\dfrac{2}{3}\right):\dfrac{11}{5}\)
\(=\dfrac{3}{7}-\dfrac{13}{15}:\dfrac{11}{15}\)
\(=\dfrac{3}{7}-\dfrac{11}{5}=\dfrac{13}{33}\)
- 6/7.8/13+6/13.9/7-3/13.6/7
- (-3,2).15/64+(0,8-2 4/15):3 2/3
- 1,4.15/49-(4/5+2/3):2 1/5
/ 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