`2/5-5/7*14/25`
`=2/5-(5.14)/(7.25)`
`=2/5-(5.7.2)/(7.5.5)`
`=2/5-2/5=0`
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a)dfrac{2}{3}x-1dfrac{3}{2}b)| 5x - dfrac{1}{2}| - dfrac{2}{7} 25%c)dfrac{x-3}{4}dfrac{16}{x-3}d)dfrac{-8}{13}+dfrac{7}{17}+dfrac{21}{31}x≤dfrac{-9}{14}+4+dfrac{5}{-14}(xϵZ)
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a)\(\dfrac{2}{3}\)x-1=\(\dfrac{3}{2}\)
b)| 5x - \(\dfrac{1}{2}\)| - \(\dfrac{2}{7}\)= 25%
c)\(\dfrac{x-3}{4}\)=\(\dfrac{16}{x-3}\)
d)\(\dfrac{-8}{13}\)+\(\dfrac{7}{17}+\dfrac{21}{31}\)<x≤\(\dfrac{-9}{14}\)+4+\(\dfrac{5}{-14}\)(xϵZ)
\(\dfrac{\left(13\dfrac{1}{4}-2\dfrac{5}{27}-10\dfrac{5}{6}\right)\cdot230\dfrac{1}{25}+46\dfrac{3}{4}}{\left(1\dfrac{3}{7}+\dfrac{10}{3}\right):\left(12\dfrac{1}{3}-14\dfrac{2}{7}\right)}\) tính giúp mình với
1) Thực hiện phép tính nhanh nhất nếu có thể:a) dfrac{2}{7}+dfrac{7}{7}.dfrac{14}{25}b) dfrac{6}{7}+dfrac{5}{7}:5-dfrac{8}{9}c)left(dfrac{-5}{28}+1,75+dfrac{8}{35}right):left(-3dfrac{9}{20}right)d)70,5-528:dfrac{15}{2}e)dfrac{-7}{25}.dfrac{39}{-14}.dfrac{50}{78}
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1) Thực hiện phép tính nhanh nhất nếu có thể:
a)
\(\dfrac{2}{7}+\dfrac{7}{7}.\dfrac{14}{25}\)
b)
\(\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}\)
c)
\(\left(\dfrac{-5}{28}+1,75+\dfrac{8}{35}\right):\left(-3\dfrac{9}{20}\right)\)
d)\(70,5-528:\dfrac{15}{2}\)
e)\(\dfrac{-7}{25}.\dfrac{39}{-14}.\dfrac{50}{78}\)
Thực hiện phép tính (tính hợp lý nếu có thể): a) dfrac{5}{9}.dfrac{7}{13}+dfrac{5}{9}.dfrac{8}{13}-dfrac{5}{13}.dfrac{2}{9} b) 12dfrac{5}{14}-left(3dfrac{5}{7}+5dfrac{5}{14}right) c)dfrac{-2}{5}+dfrac{7}{11}+dfrac{-11}{10}+dfrac{7}{-11} d) dfrac{1}{2}+dfrac{-2}{3}+dfrac{1}{6}+dfrac{-2}{5}
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Thực hiện phép tính (tính hợp lý nếu có thể):
a) \(\dfrac{5}{9}.\dfrac{7}{13}+\dfrac{5}{9}.\dfrac{8}{13}-\dfrac{5}{13}.\dfrac{2}{9}\) b) \(12\dfrac{5}{14}-\left(3\dfrac{5}{7}+5\dfrac{5}{14}\right)\)
c)\(\dfrac{-2}{5}+\dfrac{7}{11}+\dfrac{-11}{10}+\dfrac{7}{-11}\) d) \(\dfrac{1}{2}+\dfrac{-2}{3}+\dfrac{1}{6}+\dfrac{-2}{5}\)
Bài 1: Thực hiện phép tính:
1) \(\dfrac{-17}{30}-\dfrac{11}{-15}+\dfrac{-7}{12}\)
2) \(\dfrac{-5}{9}+\dfrac{5}{9}:\left(1\dfrac{2}{3}-2\dfrac{1}{12}\right)\)
3) \(\dfrac{-7}{25}.\dfrac{11}{13}+\dfrac{-7}{25}.\dfrac{2}{13}-\dfrac{18}{25}\)
1.tính
a)\(\left(4-\dfrac{12}{5}\right).\dfrac{25}{8}-\dfrac{2}{5}:\dfrac{-4}{25}\)
b)\(\left(\dfrac{-5}{24}+\dfrac{3}{4}-\dfrac{7}{12}\right):\left(\dfrac{-5}{16}\right)\)
c)\(\dfrac{6}{7}+\dfrac{5}{4}:\left(-5\right)-\dfrac{-1}{28}.\left(-2\right)^2\)
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TD
31 tháng 5 2021 lúc 20:45
tính nhanh:
\(\dfrac{-5}{7}\).\(\dfrac{2}{11}\)+\(\dfrac{-5}{7}\).\(\dfrac{9}{14}\)+1\(\dfrac{5}{7}\)
1/ (left(-dfrac{2}{3}right)^2 x dfrac{-9}{8} - 25% x dfrac{-16}{5} 2/ -1dfrac{2}{5} x 75% + dfrac{-7}{5} x 25% 3/ -2dfrac{3}{7} x (-125%) + dfrac{-17}{7} x 25% 4/ (-2)^3 x (dfrac{3}{4} x 0.25) : (2dfrac{1}{4} - 1dfrac{1}{6})
Đọc tiếp
1/ (\(\left(-\dfrac{2}{3}\right)\)\(^2\) x \(\dfrac{-9}{8}\) - 25% x \(\dfrac{-16}{5}\)
2/ -1\(\dfrac{2}{5}\) x 75% + \(\dfrac{-7}{5}\) x 25%
3/ -2\(\dfrac{3}{7}\) x (-125%) + \(\dfrac{-17}{7}\) x 25%
4/ (-2)\(^3\) x (\(\dfrac{3}{4}\) x 0.25) : (2\(\dfrac{1}{4}\) - 1\(\dfrac{1}{6}\))
HS
23 tháng 5 2021 lúc 20:55
A) \(\dfrac{1}{3}\)+ 25% . 4 -\(\dfrac{1}{2}\)
B) \(\dfrac{5}{7}\) .\(\dfrac{1}{15}\) + \(\dfrac{5}{7}\) - \(\dfrac{5}{7}\) . \(\dfrac{3}{15}\)
3/ Tính hợp lí :a/ P dfrac{-2}{7} + dfrac{14}{29} + dfrac{12}{33} + dfrac{15}{29} + dfrac{21}{33} + dfrac{2}{7}b/ dfrac{2}{7} . dfrac{5}{19} + dfrac{2}{7} . dfrac{14}{19} + dfrac{21}{19} - dfrac{2}{7} . dfrac{1}{5}
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3/ Tính hợp lí :
a/ P = \(\dfrac{-2}{7}\) + \(\dfrac{14}{29}\) + \(\dfrac{12}{33}\) + \(\dfrac{15}{29}\) + \(\dfrac{21}{33}\) + \(\dfrac{2}{7}\)
b/ \(\dfrac{2}{7}\) . \(\dfrac{5}{19}\) + \(\dfrac{2}{7}\) . \(\dfrac{14}{19}\) + \(\dfrac{21}{19}\) - \(\dfrac{2}{7}\) . \(\dfrac{1}{5}\)