`8/13+(-9)/17+(-34)/13+(-8)/17`
`=(8/13 + (-34)/13) + (-9/17 + (-8)/17 )`
`= -26/13 + (-17)/17`
`=-2 + (-1)`
`=-3`
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22 tháng 2 2022 lúc 16:18
Tính:
a, \(\dfrac{3}{5}+\dfrac{-4}{9}\) b, \(\dfrac{3}{5}+\dfrac{2}{5}.\dfrac{15}{8}\)
c, \(\dfrac{7}{2}.\dfrac{8}{13}+\dfrac{8}{13}.\dfrac{-5}{2}+\dfrac{8}{13}\)
d, \(\dfrac{-5}{17}.\dfrac{-9}{23}+\dfrac{9}{23}.\dfrac{-22}{17}+11\dfrac{9}{23}\)
Bài 1 : thực hiện các phép tính ( tính hợp lí nếu có thể ):a ,dfrac{7}{2}.dfrac{8}{13}+dfrac{8}{13}.dfrac{-5}{2}+dfrac{8}{13}b , dfrac{-5}{17}.dfrac{-9}{23}+dfrac{9}{23}.dfrac{-22}{17}+11dfrac{9}{23}Bài 2 : tìm x , biết :a , dfrac{7}{8}+xdfrac{3}{5}b , dfrac{1}{3}:left(2x-1right)dfrac{-4}{24}
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Bài 1 : thực hiện các phép tính ( tính hợp lí nếu có thể ):
a ,\(\dfrac{7}{2}.\dfrac{8}{13}+\dfrac{8}{13}.\dfrac{-5}{2}+\dfrac{8}{13}\)
b , \(\dfrac{-5}{17}.\dfrac{-9}{23}+\dfrac{9}{23}.\dfrac{-22}{17}+11\dfrac{9}{23}\)
Bài 2 : tìm x , biết :
a , \(\dfrac{7}{8}+x=\dfrac{3}{5}\)
b , \(\dfrac{1}{3}:\left(2x-1\right)=\dfrac{-4}{24}\)
21 tháng 5 2022 lúc 15:51
e) \(\dfrac{9}{17}.\dfrac{3}{7}+\dfrac{9}{17}\div\dfrac{7}{4}\)
f) \(\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{4}{13}.\dfrac{6}{7}\)
bài 1 tính :dfrac{-8}{9} . dfrac{12}{19} . dfrac{9}{-4} . dfrac{19}{24} dfrac{-5}{16} . dfrac{17}{15} : dfrac{-17}{8} dfrac{4}{13} . dfrac{2}{7} + dfrac{-3}{26} + dfrac{4}{13} . dfrac{5}{7} dfrac{6}{11} . dfrac{3}{4} + dfrac{-12}{60} +dfrac{-3}{4} .dfrac{-5}{11}
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bài 1 tính :
\(\dfrac{-8}{9}\) . \(\dfrac{12}{19}\) . \(\dfrac{9}{-4}\) . \(\dfrac{19}{24}\) \(\dfrac{-5}{16}\) . \(\dfrac{17}{15}\) : \(\dfrac{-17}{8}\)
\(\dfrac{4}{13}\) . \(\dfrac{2}{7}\) + \(\dfrac{-3}{26}\) + \(\dfrac{4}{13}\) . \(\dfrac{5}{7}\) \(\dfrac{6}{11}\) . \(\dfrac{3}{4}\) + \(\dfrac{-12}{60}\) +\(\dfrac{-3}{4}\) .\(\dfrac{-5}{11}\)
Tính hợp lý:
\(a.\dfrac{3}{17}+\dfrac{-5}{13}+\dfrac{-18}{35}+\dfrac{14}{17}+\dfrac{17}{-35}+\dfrac{-8}{13}\)
\(b.\dfrac{-3}{8}\cdot\dfrac{1}{6}+\dfrac{3}{-8}\cdot\dfrac{5}{6}+\dfrac{-10}{16}\)
\(c.\dfrac{-4}{11}\cdot\dfrac{5}{15}\cdot\dfrac{11}{-4}\)
31 tháng 12 2022 lúc 19:00
C dfrac{4}{9}timesdfrac{13}{17}+dfrac{4}{17}timesdfrac{4}{9}+dfrac{2}{9}D dfrac{8}{19}timesdfrac{5}{11}+dfrac{7}{11}timesdfrac{8}{19}+dfrac{12}{11}timesdfrac{11}{19}
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C = \(\dfrac{4}{9}\)\(\times\)\(\dfrac{13}{17}\)+\(\dfrac{4}{17}\)\(\times\)\(\dfrac{4}{9}\)+\(\dfrac{2}{9}\)
D = \(\dfrac{8}{19}\)\(\times\)\(\dfrac{5}{11}\)+\(\dfrac{7}{11}\)\(\times\dfrac{8}{19}+\dfrac{12}{11}\times\dfrac{11}{19}\)
bài 3 thực hiện phép tínhadfrac{5}{8}+dfrac{3}{17}+dfrac{4}{18}+dfrac{20}{-17}+dfrac{-2}{9}+dfrac{21}{56}bleft(dfrac{9}{16}+dfrac{8}{-27}right)+left(1+dfrac{7}{16}+dfrac{-19}{27}right)cleft(dfrac{13}{5}+dfrac{7}{16}right)+left(dfrac{-15}{16}+dfrac{6}{15}right) d left(6-2dfrac{4}{5}right).3dfrac{1}{8}-1dfrac{3}{5}:dfrac{1}{4}
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bài 3 thực hiện phép tính
a\(\dfrac{5}{8}+\dfrac{3}{17}+\dfrac{4}{18}+\dfrac{20}{-17}+\dfrac{-2}{9}+\dfrac{21}{56}\)
b\(\left(\dfrac{9}{16}+\dfrac{8}{-27}\right)+\left(1+\dfrac{7}{16}+\dfrac{-19}{27}\right)\)
c\(\left(\dfrac{13}{5}+\dfrac{7}{16}\right)+\left(\dfrac{-15}{16}+\dfrac{6}{15}\right)\) d \(\left(6-2\dfrac{4}{5}\right).3\dfrac{1}{8}-1\dfrac{3}{5}:\dfrac{1}{4}\)
Tính: a) dfrac{13}{14}-dfrac{-7}{8}+dfrac{-3}{2}b) dfrac{5}{17}+dfrac{-15}{34}.dfrac{2}{5}c) dfrac{1}{5}:dfrac{1}{10}-dfrac{1}{3}.(dfrac{6}{5}-dfrac{2}{4})d) dfrac{-3}{4}:(dfrac{12}{-5}-dfrac{-7}{10})*Lưu ý: Không viết luôn kết quả, giải chi tiết.
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Tính:
a) \(\dfrac{13}{14}\)-\(\dfrac{-7}{8}\)+\(\dfrac{-3}{2}\)
b) \(\dfrac{5}{17}\)+\(\dfrac{-15}{34}\).\(\dfrac{2}{5}\)
c) \(\dfrac{1}{5}\):\(\dfrac{1}{10}\)-\(\dfrac{1}{3}\).(\(\dfrac{6}{5}\)-\(\dfrac{2}{4}\))
d) \(\dfrac{-3}{4}\):(\(\dfrac{12}{-5}\)-\(\dfrac{-7}{10}\))
*Lưu ý: Không viết luôn kết quả, giải chi tiết.