a) =43/12.1/2+1/24 b) =3/4-3/2+1/2.12/5
=43/24+1/24 =-3/4+6/5
=11/6 =9/20
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Thực hiệp phép tính:
a) \(\dfrac{2}{5}.\left(\dfrac{2}{3}-\dfrac{1}{4}\right)+\dfrac{1}{2}\)
b) 1,8:\(\dfrac{27}{-20}+\left(75\%-\dfrac{5}{16}\right):3\dfrac{1}{2}\)
tính:
a) 25%-dfrac{5}{4}+1dfrac{5}{6}
b) 75%:2dfrac{1}{5}-left(0,5right)^2.left(-7right)+2,5left(7dfrac{2}{3}-5dfrac{2}{3}right)
c) 45:2dfrac{4}{7}+50%-1,25
d) 350%:dfrac{105}{24}+4dfrac{5}{6}:2-left(0,5right)^2.30%
e) 4dfrac{2}{5}.0,5-1dfrac{3}{7}.14%+left(-0,8right)
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tính:
a) \(25\%-\dfrac{5}{4}+1\dfrac{5}{6}\)
b) \(75\%:2\dfrac{1}{5}-\left(0,5\right)^2.\left(-7\right)+2,5\left(7\dfrac{2}{3}-5\dfrac{2}{3}\right)\)
c) \(45:2\dfrac{4}{7}+50\%-1,25\)
d) \(350\%:\dfrac{105}{24}+4\dfrac{5}{6}:2-\left(0,5\right)^2.30\%\)
e) \(4\dfrac{2}{5}.0,5-1\dfrac{3}{7}.14\%+\left(-0,8\right)\)
Giúp mình với
1. Thực hiện phép tính (Tính nhanh nếu có thể):
a) left(dfrac{3}{8}+dfrac{-4}{3}+dfrac{7}{12}right)divdfrac{5}{6}+dfrac{1}{2}
b) 0,5times11dfrac{1}{3}times75%divdfrac{2}{5}+dfrac{3}{5}
c) -5^2-4dfrac{1}{2}left(10,6-1dfrac{3}{5}right)+75%
d) left(-3,2right)timesdfrac{-15}{64}+left(0,8-2dfrac{4}{15}right)div3dfrac{2}{3}
e) dfrac{-3}{5}timesdfrac{2}{7}+dfrac{-3}{5}timesdfrac{5}{7}+2dfrac{3}{5}
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Giúp mình với 
1. Thực hiện phép tính (Tính nhanh nếu có thể):
a) \(\left(\dfrac{3}{8}+\dfrac{-4}{3}+\dfrac{7}{12}\right)\div\dfrac{5}{6}+\dfrac{1}{2}\)
b) \(0,5\times11\dfrac{1}{3}\times75\%\div\dfrac{2}{5}+\dfrac{3}{5}\)
c) \(-5^2-4\dfrac{1}{2}\left(10,6-1\dfrac{3}{5}\right)+75\%\)
d) \(\left(-3,2\right)\times\dfrac{-15}{64}+\left(0,8-2\dfrac{4}{15}\right)\div3\dfrac{2}{3}\)
e) \(\dfrac{-3}{5}\times\dfrac{2}{7}+\dfrac{-3}{5}\times\dfrac{5}{7}+2\dfrac{3}{5}\)
\(\dfrac{-5}{9}+1\dfrac{5}{9}\cdot\left(\dfrac{3}{4}-\dfrac{2}{5}\right):7^2\)
\(1\dfrac{13}{15}\cdot0,75-\left(\dfrac{104}{195}+25\%\right)\cdot\dfrac{24}{47}-3\dfrac{12}{13}:3\)
\(1\dfrac{13}{15}\cdot\left(0,5\right)^2\cdot3+\left(\dfrac{8}{15}+1\dfrac{19}{60}\right):1\dfrac{23}{24}\)
Thực hiện phép tính:
\(\dfrac{1}{5}+\dfrac{3}{7}-\dfrac{4}{35}.\dfrac{5}{8}\)
(\(\dfrac{-5}{24}+0,75+\dfrac{7}{12}\)):(-2\(\dfrac{1}{8}\))
Bài 1: Thực hiện phép tính
a) left(dfrac{3}{8}+dfrac{-3}{4}+dfrac{7}{12}right):dfrac{5}{6}+dfrac{1}{2}
b) dfrac{1}{2}+dfrac{3}{4}-left(dfrac{3}{4}-dfrac{4}{5}right)
c) 6dfrac{5}{12}:2dfrac{3}{4}+11dfrac{1}{4}.left(dfrac{1}{3}dfrac{1}{5}right)
d)left(dfrac{7}{8}-dfrac{3}{4}right).1dfrac{1}{3}-dfrac{2}{7}.left(3,5right)^2
e)left(dfrac{3}{5}+0,415-dfrac{3}{200}right).2dfrac{2}{3}.0,25
f)dfrac{5}{16}:0,125-left(2dfrac{1}{4}-0,6right).dfrac{10}{11}
g) 0,25:left(10,3-9,8right)-dfrac{3}{4}
h)1dfrac{13...
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Bài 1: Thực hiện phép tính
a) \(\left(\dfrac{3}{8}+\dfrac{-3}{4}+\dfrac{7}{12}\right):\dfrac{5}{6}+\dfrac{1}{2}\)
b) \(\dfrac{1}{2}+\dfrac{3}{4}-\left(\dfrac{3}{4}-\dfrac{4}{5}\right)\)
c) \(6\dfrac{5}{12}:2\dfrac{3}{4}+11\dfrac{1}{4}.\left(\dfrac{1}{3}\dfrac{1}{5}\right)\)
d)\(\left(\dfrac{7}{8}-\dfrac{3}{4}\right).1\dfrac{1}{3}-\dfrac{2}{7}.\left(3,5\right)^2\)
e)\(\left(\dfrac{3}{5}+0,415-\dfrac{3}{200}\right).2\dfrac{2}{3}.0,25\)
f)\(\dfrac{5}{16}:0,125-\left(2\dfrac{1}{4}-0,6\right).\dfrac{10}{11}\)
g) \(0,25:\left(10,3-9,8\right)-\dfrac{3}{4}\)
h)\(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+20\%\right):\dfrac{7}{3}\)
i)\(\dfrac{\left(\dfrac{1}{2-0,75}\right).\left(0,2-\dfrac{2}{5}\right)}{\dfrac{5}{9}-1\dfrac{1}{12}}\)
k)\(\dfrac{\dfrac{2}{3}+\dfrac{2}{7}-\dfrac{1}{14}}{-1-\dfrac{3}{7}+\dfrac{3}{28}}\)
Bài 2: Tính bằng cánh hợp lí
A=\(0,7.2\dfrac{2}{3}.20.0,375.\dfrac{5}{28}\)
B=\(\left(9\dfrac{30303}{80808}+7\dfrac{303030}{484848}\right)+4,03\)
C=\(\left(9,75.21\dfrac{3}{7}+\dfrac{39}{4}.18\dfrac{4}{7}\right).\dfrac{15}{78}\)
D=\(10101.\left(\dfrac{5}{111111}+\dfrac{5}{222222}-\dfrac{4}{3.7.11.13.37}\right)\)
tinh: \(\dfrac{3}{4}-1\dfrac{1}{2}+0,5:\dfrac{5}{12}\)
tinh:
a. \(\dfrac{3}{4}-1\dfrac{1}{2}+0,5:\dfrac{5}{12}\)
b. \(\left(-2\right)^2-1\dfrac{5}{27}.\left(-\dfrac{3}{2}\right)^3\)
c. \(\dfrac{1}{2.3}+\dfrac{1}{3.4}+\dfrac{1}{4.5}+...+\dfrac{1}{99.100}\)
Thực hiện phép tính bằng cách hợp lí :
\(B=1\dfrac{6}{41}\cdot\left(\dfrac{12+\dfrac{12}{9}-\dfrac{12}{37}-\dfrac{12}{53}}{3+\dfrac{1}{3}-\dfrac{3}{37}-\dfrac{3}{53}}:\dfrac{4+\dfrac{4}{17}+\dfrac{4}{19}+\dfrac{4}{2006}}{5+\dfrac{5}{17}+\dfrac{5}{19}+\dfrac{5}{2006}}\right)\cdot\dfrac{124242423}{237373735}\)