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Tính nhanh:
\(\left(\dfrac{67}{111}+\dfrac{2}{33}-\dfrac{15}{117}\right).\left(\dfrac{1}{3}-\dfrac{1}{4}-\dfrac{1}{12}\right)\)
8 tháng 9 2017 lúc 11:40
thực hiện phép tính
adfrac{5}{7}+dfrac{9}{23}+dfrac{-12}{7}+dfrac{14}{23}
bleft(7-2dfrac{3}{5}right).2dfrac{4}{33}-2dfrac{3}{5}:dfrac{1}{2}+dfrac{7}{5}
cdfrac{-7}{9}:dfrac{8}{15}+dfrac{-7}{9}.dfrac{7}{15}+5dfrac{7}{9}
dleft(16dfrac{3}{8}-19dfrac{3}{4}right)-left(12dfrac{3}{8}-17dfrac{3}{4}right)
giúp mình nhé
Đọc tiếp
thực hiện phép tính
a\(\dfrac{5}{7}+\dfrac{9}{23}+\dfrac{-12}{7}+\dfrac{14}{23}\)
b\(\left(7-2\dfrac{3}{5}\right).2\dfrac{4}{33}-2\dfrac{3}{5}:\dfrac{1}{2}+\dfrac{7}{5}\)
c\(\dfrac{-7}{9}:\dfrac{8}{15}+\dfrac{-7}{9}.\dfrac{7}{15}+5\dfrac{7}{9}\)
d\(\left(16\dfrac{3}{8}-19\dfrac{3}{4}\right)-\left(12\dfrac{3}{8}-17\dfrac{3}{4}\right)\)
giúp mình nhé
Chứng minh
A = \(\dfrac{1}{5}\) + \(\dfrac{1}{13}\) + \(\dfrac{1}{14}\) + \(\dfrac{1}{15}\) + \(\dfrac{1}{61}\) + \(\dfrac{1}{62}\) + \(\dfrac{1}{63}\) < \(\dfrac{1}{2}\)
a)(dfrac{2}{9}(6x-dfrac{3}{4})-3(dfrac{1}{4}x-dfrac{1}{5})dfrac{-8}{15}
b)dfrac{3}{4}(x-dfrac{8}{9})-5(x-dfrac{11}{15})+dfrac{1}{2}x5dfrac{1}{12}
c)dfrac{2}{3}(-3x-dfrac{6}{5})-dfrac{5}{7}(dfrac{49}{15}-14x)-2dfrac{1}{3}
d)(12dfrac{7}{8}-10dfrac{13}{8}):x-1dfrac{7}{33}:dfrac{8}{11}1dfrac{2}{3}
Đọc tiếp
a)(\(\dfrac{2}{9}\)(6x-\(\dfrac{3}{4}\))-3(\(\dfrac{1}{4}\)x-\(\dfrac{1}{5}\))=\(\dfrac{-8}{15}\)
b)\(\dfrac{3}{4}\)(x-\(\dfrac{8}{9}\))-5(x-\(\dfrac{11}{15}\))+\(\dfrac{1}{2}\)x=5\(\dfrac{1}{12}\)
c)\(\dfrac{2}{3}\)(-3x-\(\dfrac{6}{5}\))-\(\dfrac{5}{7}\)(\(\dfrac{49}{15}\)-14x)=-2\(\dfrac{1}{3}\)
d)(12\(\dfrac{7}{8}\)-10\(\dfrac{13}{8}\)):x-1\(\dfrac{7}{33}\):\(\dfrac{8}{11}\)=1\(\dfrac{2}{3}\)
Tính :
a) \(1\dfrac{13}{15}.\left(0,5\right)^2.3+\left(\dfrac{8}{15}-1\dfrac{19}{60}\right):1\dfrac{23}{24}\)
b) \(\dfrac{\left(\dfrac{11^2}{200}+0,415\right):0,01}{\dfrac{1}{12}-37,25+3\dfrac{1}{6}}\)
a, \(\dfrac{1}{3}.\dfrac{4}{5}+\dfrac{1}{3}.\dfrac{6}{5}-\dfrac{4}{3}\)
b, \(\dfrac{4}{19}-\dfrac{-3}{7}+\dfrac{-3}{7}.\dfrac{15}{19}+\dfrac{5}{7}\)
c, \(\dfrac{5}{9}.\dfrac{7}{13}+\dfrac{5}{9}.\dfrac{9}{13}-\dfrac{5}{9}.\dfrac{3}{13}\)
Cho A = \(\dfrac{\left(3\dfrac{2}{15}+\dfrac{1}{5}\right):2\dfrac{1}{2}}{\left(5\dfrac{3}{7}-2\dfrac{1}{4}\right):4\dfrac{43}{56}}\) ; B = \(\dfrac{1,2:\left(1\dfrac{1}{5}.1\dfrac{1}{4}\right)}{0,32+\dfrac{2}{25}}\)
Chứng minh rằng A= B
Tính nhanh
A=\(\dfrac{3}{4}.\dfrac{8}{9}.\dfrac{15}{16}....\dfrac{2409}{2500}\)
các bạn giúp mình nhé mình đang cần gấp ạ
a.dfrac{5}{-4}.dfrac{16}{25}+dfrac{-5}{4}.dfrac{9}{25} (. là nhân nhé ạ ) e.11dfrac{1}{4}-(2dfrac{5}{7}+5dfrac{1}{4})
b.4dfrac{11}{23}-dfrac{9}{14}+2dfrac{12}{23}-dfrac{5}{4} g.dfrac{7}{19}.dfrac{8}{11}+dfrac{7}{19}.dfrac{3}{11}+dfrac{12}{19}
c.2dfrac{13}{27}-dfrac{7}{15}+3dfrac{14}{27}-dfrac{8}{15} h.-left(dfrac{1}{2}right)^2 .13dfrac{9}{11}-...
Đọc tiếp
các bạn giúp mình nhé mình đang cần gấp ạ
a.\(\dfrac{5}{-4}\).\(\dfrac{16}{25}\)+\(\dfrac{-5}{4}\).\(\dfrac{9}{25}\) (. là nhân nhé ạ ) e.\(11\dfrac{1}{4}\)-(\(2\dfrac{5}{7}\)+\(5\dfrac{1}{4}\))
b.\(4\dfrac{11}{23}\)-\(\dfrac{9}{14}\)+\(2\dfrac{12}{23}\)-\(\dfrac{5}{4}\) g.\(\dfrac{7}{19}\).\(\dfrac{8}{11}\)+\(\dfrac{7}{19}\).\(\dfrac{3}{11}\)+\(\dfrac{12}{19}\)
c.\(2\dfrac{13}{27}\)-\(\dfrac{7}{15}\)+\(3\dfrac{14}{27}\)-\(\dfrac{8}{15}\) h.\(-\left(\dfrac{1}{2}\right)^2\) .13\(\dfrac{9}{11}\)-25%.6\(\dfrac{2}{11}\)
d.\(\dfrac{-4}{9}\).\(\dfrac{7}{15}\)+\(\dfrac{4}{-9}\).\(\dfrac{8}{15}\) i.57%+1\(\dfrac{2}{15}\):\(\dfrac{68}{25}\)-2,82