Các câu hỏi tương tự
tinh nhanh
A=\dfrac{1}{3}-\dfrac{3}{4}-\left(\dfrac{-3}{5}\right)+\dfrac{1}{64}-\dfrac{2}{9}-\dfrac{1}{36}+\dfrac{1}{15}
B=\dfrac{1}{3}-\dfrac{3}{5}+\dfrac{5}{7}-\dfrac{7}{9}+\dfrac{9}{11}-\dfrac{11}{3}+\dfrac{13}{15}+\dfrac{11}{15}-\dfrac{9}{11}+\dfrac{7}{9}+\dfrac{7}{9}-\dfrac{5}{7}+\dfrac{3}{3}-\dfrac{1}{3}
giup minh nhe minh dang can gap
Tính (hợp lí nếu có thể)
dfrac{1}{3} - dfrac{3}{5} + dfrac{5}{7} - dfrac{7}{9} + dfrac{9}{11} - dfrac{11}{13} + dfrac{13}{15} + dfrac{11}{13} - dfrac{9}{11} + dfrac{7}{9} - dfrac{5}{7} + dfrac{3}{5} - dfrac{1}{3}
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Tính (hợp lí nếu có thể)
\(\dfrac{1}{3}\) - \(\dfrac{3}{5}\) + \(\dfrac{5}{7}\) - \(\dfrac{7}{9}\) + \(\dfrac{9}{11}\) - \(\dfrac{11}{13}\) + \(\dfrac{13}{15}\) + \(\dfrac{11}{13}\) - \(\dfrac{9}{11}\) + \(\dfrac{7}{9}\) - \(\dfrac{5}{7}\) + \(\dfrac{3}{5}\) - \(\dfrac{1}{3}\)
Tìm x:
a) dfrac{11}{12} - (dfrac{2}{5} + dfrac{3}{4}x) dfrac{2}{3}
b) dfrac{-2}{5} + dfrac{5}{3} . (dfrac{3}{2} - dfrac{4}{15}x) dfrac{-7}{6}
c) dfrac{1}{2} + dfrac{3}{4}x dfrac{1}{4}
Đọc tiếp
Tìm x:
a) \(\dfrac{11}{12}\) - (\(\dfrac{2}{5}\) + \(\dfrac{3}{4}\)x) \(\dfrac{2}{3}\)
b) \(\dfrac{-2}{5}\) + \(\dfrac{5}{3}\) . (\(\dfrac{3}{2}\) - \(\dfrac{4}{15}\)x) = \(\dfrac{-7}{6}\)
c) \(\dfrac{1}{2}\) + \(\dfrac{3}{4}\)x = \(\dfrac{1}{4}\)
a) dfrac{2}{3}+dfrac{3}{4}.left(-dfrac{4}{9}right)
b) -dfrac{5}{7}.dfrac{31}{33}+-dfrac{5}{7}:dfrac{33}{2}
c) -dfrac{3}{5}.dfrac{13}{11} _ -dfrac{3}{5}.dfrac{2}{11}
Đọc tiếp
a) \(\dfrac{2}{3}\)+\(\dfrac{3}{4}\).\(\left(-\dfrac{4}{9}\right)\)
b) \(-\dfrac{5}{7}\).\(\dfrac{31}{33}\)+\(-\dfrac{5}{7}\):\(\dfrac{33}{2}\)
c) \(-\dfrac{3}{5}\).\(\dfrac{13}{11}\) _ \(-\dfrac{3}{5}\).\(\dfrac{2}{11}\)
22 tháng 10 2021 lúc 8:23
Bài 1 : Thực hiện phép tính a) dfrac{19}{12} + | dfrac{-5}{2} | + ( dfrac{3}{2} )2b) dfrac{2}{11} . dfrac{16}{9} - dfrac{2}{11} . dfrac{7}{9}Bài 2 : Tìm x , biết dfrac{a}{8} dfrac{b}{3} và a - b 55
Đọc tiếp
Bài 1 : Thực hiện phép tính
a) \(\dfrac{19}{12}\) + | \(\dfrac{-5}{2}\) | + ( \(\dfrac{3}{2}\) )2
b) \(\dfrac{2}{11}\) . \(\dfrac{16}{9}\) - \(\dfrac{2}{11}\) . \(\dfrac{7}{9}\)
Bài 2 : Tìm x , biết
\(\dfrac{a}{8}\) = \(\dfrac{b}{3}\) và a - b = 55
a) dfrac{15}{11} - (dfrac{5}{7} - dfrac{18}{11}) + dfrac{27}{7}
b) dfrac{39}{5}+ (dfrac{9}{4} - dfrac{9}{5}) - (dfrac{5}{4} + 1,2)
c) -1,2 - 0,8 + 0,25 + 5,75 - 2022
d) 0,1 + dfrac{16}{9} + 5,1 + dfrac{-20}{9}
Đọc tiếp
a) \(\dfrac{15}{11}\) - (\(\dfrac{5}{7}\) - \(\dfrac{18}{11}\)) + \(\dfrac{27}{7}\)
b) \(\dfrac{39}{5}\)+ (\(\dfrac{9}{4}\) - \(\dfrac{9}{5}\)) - (\(\dfrac{5}{4}\) + 1,2)
c) -1,2 - 0,8 + 0,25 + 5,75 - 2022
d) 0,1 + \(\dfrac{16}{9}\) + 5,1 + \(\dfrac{-20}{9}\)
Bài 4: tìm x:a) dfrac{4}{3} + (1,25 - x) 2,25b) dfrac{17}{6} - (x - dfrac{7}{6} ) dfrac{7}{4}c) 4 - (2x + 1) 3 - dfrac{1}{3}bài 15:a) (dfrac{-2}{3})9 : x (dfrac{-2}{3})b) x : (dfrac{4}{9})5 (dfrac{4}{9})4c) (x + 4)3 -125d) (10 - 5x)3 64e) (4x + 5)2 81Bài 16:a) 4 - 1dfrac{2}{5} - dfrac{8}{3}b) -0,6 - dfrac{-4}{9} - dfrac{16}{15}c) -dfrac{15}{4} . (dfrac{-7}{15}) . (-2dfrac{2}{5}Gi ải gấp giúp mình ạ, mình rất cần gấp
Đọc tiếp
Bài 4: tìm x:
a) \(\dfrac{4}{3}\) + (1,25 - x) = 2,25
b) \(\dfrac{17}{6}\) - (x - \(\dfrac{7}{6}\) ) = \(\dfrac{7}{4}\)
c) 4 - (2x + 1) = 3 - \(\dfrac{1}{3}\)
bài 15:
a) (\(\dfrac{-2}{3}\))9 : x = (\(\dfrac{-2}{3}\))
b) x : (\(\dfrac{4}{9}\))5 = (\(\dfrac{4}{9}\))4
c) (x + 4)3 = -125
d) (10 - 5x)3 = 64
e) (4x + 5)2 = 81
Bài 16:
a) 4 - \(1\dfrac{2}{5}\) - \(\dfrac{8}{3}\)
b) -0,6 - \(\dfrac{-4}{9}\) - \(\dfrac{16}{15}\)
c) \(-\dfrac{15}{4}\) . (\(\dfrac{-7}{15}\)) . (\(-2\dfrac{2}{5}\)
Gi ải gấp giúp mình ạ, mình rất cần gấp
Tìm x :
a, dfrac{11}{12} - (dfrac{2}{5} +x) dfrac{2}{3} b, x+dfrac{2}{3} dfrac{3}{5} - dfrac{-1}{6} c, x-[dfrac{17}{2} -(dfrac{-3}{7} + dfrac{5}{3} )]dfrac{-1}{3}
d,dfrac{9}{2} - [dfrac{2}{3} - (x+dfrac{7}{4} )] dfrac{-5}{4}
Mọi người giúp mình nha
Đọc tiếp
Tìm x :
a, \(\dfrac{11}{12}\) - (\(\dfrac{2}{5}\) +x) = \(\dfrac{2}{3}\) b, x+\(\dfrac{2}{3}\) =\(\dfrac{3}{5}\) - \(\dfrac{-1}{6}\) c, x-[\(\dfrac{17}{2}\) -(\(\dfrac{-3}{7}\) + \(\dfrac{5}{3}\) )]=\(\dfrac{-1}{3}\)
d,\(\dfrac{9}{2}\) - [\(\dfrac{2}{3}\) - (x+\(\dfrac{7}{4}\) )] =\(\dfrac{-5}{4}\)
Mọi người giúp mình nha
\(\dfrac{\dfrac{2}{5}-\dfrac{2}{9}+\dfrac{2}{11}}{\dfrac{7}{5}-\dfrac{7}{9}+\dfrac{7}{11}}-\dfrac{\dfrac{1}{3}-}{1\dfrac{1}{6}-}\dfrac{\dfrac{1}{4}}{\dfrac{7}{8}+}\dfrac{+\dfrac{1}{5}}{0,7}\)