Ôn tập toán 6
Các câu hỏi tương tự
S = 1,2 + 2,3 + ... + 8,9 + 9,10 + 10,11 + ... + 98,99 + 99,100 + 100,101 + ... + 998,999
tính:
a) 2dfrac{3}{4}.left(-0,4right)-1dfrac{3}{5}.2,75+left(-1,2right):dfrac{4}{11}
b) 1,4.dfrac{15}{49}-left(dfrac{4}{5}+dfrac{2}{3}right):2dfrac{1}{5}
c) left(-3,2right).dfrac{15}{64}+left(0,8-2dfrac{4}{15}right):3dfrac{2}{3}
d) 0,02.dfrac{-25}{2}+dfrac{3}{8}+left(-2dfrac{9}{20}right).dfrac{2}{7}
e) 34%:dfrac{51}{16}-3dfrac{7}{9}.6,5-left(0,4right)^2
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tính:
a) \(2\dfrac{3}{4}.\left(-0,4\right)-1\dfrac{3}{5}.2,75+\left(-1,2\right):\dfrac{4}{11}\)
b) \(1,4.\dfrac{15}{49}-\left(\dfrac{4}{5}+\dfrac{2}{3}\right):2\dfrac{1}{5}\)
c) \(\left(-3,2\right).\dfrac{15}{64}+\left(0,8-2\dfrac{4}{15}\right):3\dfrac{2}{3}\)
d) \(0,02.\dfrac{-25}{2}+\dfrac{3}{8}+\left(-2\dfrac{9}{20}\right).\dfrac{2}{7}\)
e) \(34\%:\dfrac{51}{16}-3\dfrac{7}{9}.6,5-\left(0,4\right)^2\)
Bài 1: Thực hiện phép tính:
a, left(dfrac{7}{20}+dfrac{11}{15}-dfrac{15}{12}right):left(dfrac{11}{20}-dfrac{26}{45}right)
b, dfrac{5-dfrac{5}{3}+dfrac{5}{9}-dfrac{5}{27}}{8-dfrac{8}{3}+dfrac{8}{9}-dfrac{8}{27}}:dfrac{15-dfrac{15}{11}+dfrac{15}{121}}{16-dfrac{16}{11}+dfrac{16}{121}}
c, dfrac{dfrac{1}{9}-dfrac{5}{6}-4}{dfrac{7}{12}-dfrac{1}{36}-10}
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Bài 1: Thực hiện phép tính:
a, \(\left(\dfrac{7}{20}+\dfrac{11}{15}-\dfrac{15}{12}\right):\left(\dfrac{11}{20}-\dfrac{26}{45}\right)\)
b, \(\dfrac{5-\dfrac{5}{3}+\dfrac{5}{9}-\dfrac{5}{27}}{8-\dfrac{8}{3}+\dfrac{8}{9}-\dfrac{8}{27}}:\dfrac{15-\dfrac{15}{11}+\dfrac{15}{121}}{16-\dfrac{16}{11}+\dfrac{16}{121}}\)
c, \(\dfrac{\dfrac{1}{9}-\dfrac{5}{6}-4}{\dfrac{7}{12}-\dfrac{1}{36}-10}\)
Tính :
a) dfrac{17}{23}.dfrac{8}{16}.dfrac{23}{17}.left(-80right).dfrac{3}{4}
b) dfrac{5}{11}.dfrac{18}{29}-dfrac{5}{11}.dfrac{8}{29}+dfrac{5}{11}.dfrac{19}{29}
c) left(dfrac{13}{23}+dfrac{1313}{2323}-dfrac{131313}{232323}right).left(dfrac{1}{3}+dfrac{1}{4}-dfrac{7}{12}right)
d) dfrac{1^2}{1.2}.dfrac{2^{2^{ }}}{2.3}.dfrac{3^2}{3.4}.dfrac{4^2}{4.5}.dfrac{5^2}{5.6}.dfrac{6^2}{6.7}.dfrac{7^2}{7.8}.dfrac{8^2}{8.9}.dfrac{9^2}{9.10}
e) dfrac{2^2}{3}.dfrac{3^2}{8}.dfrac{4^...
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Tính :
a) \(\dfrac{17}{23}.\dfrac{8}{16}.\dfrac{23}{17}.\left(-80\right).\dfrac{3}{4}\)
b) \(\dfrac{5}{11}.\dfrac{18}{29}-\dfrac{5}{11}.\dfrac{8}{29}+\dfrac{5}{11}.\dfrac{19}{29}\)
c) \(\left(\dfrac{13}{23}+\dfrac{1313}{2323}-\dfrac{131313}{232323}\right).\left(\dfrac{1}{3}+\dfrac{1}{4}-\dfrac{7}{12}\right)\)
d) \(\dfrac{1^2}{1.2}.\dfrac{2^{2^{ }}}{2.3}.\dfrac{3^2}{3.4}.\dfrac{4^2}{4.5}.\dfrac{5^2}{5.6}.\dfrac{6^2}{6.7}.\dfrac{7^2}{7.8}.\dfrac{8^2}{8.9}.\dfrac{9^2}{9.10}\)
e) \(\dfrac{2^2}{3}.\dfrac{3^2}{8}.\dfrac{4^2}{15}.\dfrac{5^2}{24}.\dfrac{6^2}{35}\dfrac{7^2}{48}.\dfrac{8^2}{63}.\dfrac{9^2}{80}\)
BT2: Tính nhanh
9) (\(\left(5+\dfrac{1}{5}-\dfrac{2}{9}\right)-\left(2-\dfrac{1}{23}-2\dfrac{3}{35}+\dfrac{5}{6}\right)-\left(8+\dfrac{2}{7}-\dfrac{1}{18}\right)\)
10)\(\dfrac{1}{3}-\dfrac{3}{4}-\left(-\dfrac{3}{5}\right)+\dfrac{1}{64}-\dfrac{2}{9}-\dfrac{1}{36}+\dfrac{1}{15}\)
HD
4 tháng 8 2017 lúc 16:29
Bài 1:
\(a)5\dfrac{1}{20}+\dfrac{8}{9}-\dfrac{15}{25}+\dfrac{75}{-18}\)
\(b)\dfrac{1}{15}+\dfrac{1}{35}+\dfrac{1}{63}+\dfrac{1}{99}+\dfrac{1}{143}\)
\(c)\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}.\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}.\left(-2\right)^2\)
tìm x
\([\dfrac{6:\dfrac{3}{5}-1\dfrac{1}{16}.\dfrac{16}{7}}{4\dfrac{1}{5}-\dfrac{10}{11}+5\dfrac{2}{11}}-\dfrac{\left(\dfrac{3}{20}+\dfrac{1}{2}-\dfrac{1}{5}\right).\dfrac{12}{49}}{3\dfrac{1}{3}+\dfrac{2}{9}}].x=2\dfrac{23}{96}\)
CMR:
a) \(\dfrac{1}{2^2}+\dfrac{1}{4^2}+\dfrac{1}{6^2}+...+\dfrac{1}{100^2}< \dfrac{1}{2}\)
b) \(\dfrac{3}{4}+\dfrac{8}{9}+\dfrac{15}{16}+...+\dfrac{2499}{2500}>48\)
tính
dfrac{-5}{8}:dfrac{15}{4} dfrac{-15}{17}:dfrac{25}{-34} -48:(dfrac{-24}{5}) dfrac{-30}{7}:(dfrac{-5}{-14})
dfrac{15}{28}:(dfrac{-9}{14}) dfrac{-7}{40}:(-dfrac{21}{20}) (dfrac{-4}{15}).(-dfrac{-25}{8}) dfrac{5}{-14}.(-dfrac{7}{10})
dfrac{-15}{4}.(-dfrac{16}{25}) 15.(-dfrac{13}{10}) (-dfrac{14}{5}).-10 (dfrac{3}{-10}).(-dfrac{-15}{2})
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tính
\(\dfrac{-5}{8}:\dfrac{15}{4}\) \(\dfrac{-15}{17}:\dfrac{25}{-34}\) \(-48:(\dfrac{-24}{5})\) \(\dfrac{-30}{7}:(\dfrac{-5}{-14})\)
\(\dfrac{15}{28}:(\dfrac{-9}{14})\) \(\dfrac{-7}{40}:(-\dfrac{21}{20})\) \((\dfrac{-4}{15}).(-\dfrac{-25}{8})\) \(\dfrac{5}{-14}.(-\dfrac{7}{10})\)
\(\dfrac{-15}{4}.(-\dfrac{16}{25})\) \(15.(-\dfrac{13}{10})\) \((-\dfrac{14}{5}).-10\) \((\dfrac{3}{-10}).(-\dfrac{-15}{2})\)