\(=\dfrac{48}{120}-\dfrac{45}{120}+\dfrac{140}{120}=\dfrac{143}{120}\)
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Tính nhanh:
a) 2.dfrac{3}{7}+left(dfrac{2}{9}-1dfrac{3}{7}right)-dfrac{5}{3}:dfrac{1}{9}
b) dfrac{-11}{23}.dfrac{6}{7}+dfrac{8}{7}.dfrac{-11}{23}-dfrac{1}{23}
c) left(dfrac{377}{-231}-dfrac{123}{89}+dfrac{34}{791}right).left(dfrac{1}{6}-dfrac{1}{8}-dfrac{1}{24}right)
d) 19dfrac{5}{8}:dfrac{7}{12}-15dfrac{1}{4}:dfrac{7}{12}
e) dfrac{2}{5}.dfrac{1}{3}-dfrac{2}{15}:dfrac{1}{5}+dfrac{3}{5}.dfrac{1}{3}
Đọc tiếp
Tính nhanh:
a) \(2.\dfrac{3}{7}+\left(\dfrac{2}{9}-1\dfrac{3}{7}\right)-\dfrac{5}{3}:\dfrac{1}{9}\)
b) \(\dfrac{-11}{23}.\dfrac{6}{7}+\dfrac{8}{7}.\dfrac{-11}{23}-\dfrac{1}{23}\)
c) \(\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).\left(\dfrac{1}{6}-\dfrac{1}{8}-\dfrac{1}{24}\right)\)
d) \(19\dfrac{5}{8}:\dfrac{7}{12}-15\dfrac{1}{4}:\dfrac{7}{12}\)
e) \(\dfrac{2}{5}.\dfrac{1}{3}-\dfrac{2}{15}:\dfrac{1}{5}+\dfrac{3}{5}.\dfrac{1}{3}\)
\(\dfrac{-1}{9}.\dfrac{-3}{5}+\dfrac{5}{-6}.\dfrac{-3}{5}-\dfrac{7}{2}.\dfrac{3}{5}\)
\(\dfrac{-3}{7}.\dfrac{15}{13}.\dfrac{3}{7}.\dfrac{11}{13}-\dfrac{3}{7}\)
Đề bài: Tính nhanh
Tính nhanh: dfrac{2}{5}-dfrac{3}{8}+dfrac{7}{6}:dfrac{7}{5}SOS! Giúp mình với, mình sắp phải đi ngủ!! Mệt ghê á tròi! Cảm ơn các bạn trước nhé!
Đọc tiếp
Tính nhanh: \(\dfrac{2}{5}-\dfrac{3}{8}+\dfrac{7}{6}:\dfrac{7}{5}\)
SOS! 
Giúp mình với, mình sắp phải đi ngủ!!
Mệt ghê á tròi! Cảm ơn các bạn trước nhé!
12 tháng 3 2022 lúc 14:25
Tính bằng cách hợp lý:a,dfrac{2}{3}+left(dfrac{5}{7}+dfrac{-2}{3}right) b,left(dfrac{-1}{4}+dfrac{5}{8}right)+dfrac{-3}{8}c,dfrac{7}{5}.dfrac{8}{19}+dfrac{7}{5}.dfrac{12}{19}-dfrac{7}{5}.dfrac{1}{19}d,6dfrac{3}{10}-left(3dfrac{4}{7}+2dfrac{3}{10}right)e,left(31,12-5,97right)-left(-68,88+4,03right)h,3,7.left(-10,56right)+3,7.110,56
Đọc tiếp
Tính bằng cách hợp lý:
\(a,\dfrac{2}{3}+\left(\dfrac{5}{7}+\dfrac{-2}{3}\right)\)
\(b,\left(\dfrac{-1}{4}+\dfrac{5}{8}\right)+\dfrac{-3}{8}\)
\(c,\dfrac{7}{5}.\dfrac{8}{19}+\dfrac{7}{5}.\dfrac{12}{19}-\dfrac{7}{5}.\dfrac{1}{19}\)
\(d,6\dfrac{3}{10}-\left(3\dfrac{4}{7}+2\dfrac{3}{10}\right)\)
\(e,\left(31,12-5,97\right)-\left(-68,88+4,03\right)\)
\(h,3,7.\left(-10,56\right)+3,7.110,56\)
\(\dfrac{2}{7}-\dfrac{-3}{11}+\dfrac{5}{7}-\dfrac{1}{-4}-\dfrac{6}{11}\) Tính nhanh
Tính giá trị của biểu thức sau:
\(\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}.\left(-2\right)^2\)
\(\dfrac{2}{3}+\dfrac{1}{3}.\left(-\dfrac{4}{9}+\dfrac{5}{6}\right):\dfrac{7}{12}\)
Thực hiện phép tính:
a) dfrac{8}{13} + dfrac{5}{13}
b)dfrac{2}{3} + dfrac{-2}{5} + dfrac{-5}{6} - dfrac{13}{10}
c) -dfrac{2}{7} - (dfrac{5}{11} - dfrac{9}{7}) + dfrac{5}{11}
d) dfrac{-3}{7} x dfrac{-1}{9} + dfrac{7}{-18} x dfrac{-3}{7} + dfrac{5}{6} x dfrac{-3}{7}
e) 11dfrac{1}{4} - (2dfrac{5}{7} + 5dfrac{1}{4})
f) (8dfrac{5}{11} + 3dfrac{5}{8}) - 3dfrac{5}{11}
g) -dfrac{1}{4} x 13dfrac{9}{11} - 0,25 x 6dfrac{2}{11}
h) dfrac{4}{9} : (-dfrac{1}{7}) + 6dfrac{5}{9} : (-dfrac{1}{7})
Đọc tiếp
Thực hiện phép tính:
a) \(\dfrac{8}{13}\) + \(\dfrac{5}{13}\)
b)\(\dfrac{2}{3}\) + \(\dfrac{-2}{5}\) + \(\dfrac{-5}{6}\) - \(\dfrac{13}{10}\)
c) -\(\dfrac{2}{7}\) - (\(\dfrac{5}{11}\) - \(\dfrac{9}{7}\)) + \(\dfrac{5}{11}\)
d) \(\dfrac{-3}{7}\) x \(\dfrac{-1}{9}\) + \(\dfrac{7}{-18}\) x \(\dfrac{-3}{7}\) + \(\dfrac{5}{6}\) x \(\dfrac{-3}{7}\)
e) \(11\dfrac{1}{4}\) - (\(2\dfrac{5}{7}\) + \(5\dfrac{1}{4}\))
f) (\(8\dfrac{5}{11}\) + \(3\dfrac{5}{8}\)) - \(3\dfrac{5}{11}\)
g) -\(\dfrac{1}{4}\) x \(13\dfrac{9}{11}\) - 0,25 x \(6\dfrac{2}{11}\)
h) \(\dfrac{4}{9}\) : (-\(\dfrac{1}{7}\)) + \(6\dfrac{5}{9}\) : (-\(\dfrac{1}{7}\))
Thực hiện phép tính ( tính hợ lí nếu được)
a, \(\dfrac{3}{4}+\dfrac{9}{5}:\dfrac{3}{2}-1\) b, \(\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{4}{13}.\dfrac{6}{7}\)
Bài 1. Tính A left(8dfrac{2}{7}-4dfrac{2}{7}right)-3dfrac{4}{9} B left(10dfrac{2}{9}-6dfrac{2}{9}right)+2dfrac{3}{5}Bài 2. Tính a) 5dfrac{1}{2}.3dfrac{1}{4} b) 6dfrac{1}{3}:4dfrac{2}{9} c) 4dfrac{3}{7}.2
Đọc tiếp
Bài 1. Tính
A= \(\left(8\dfrac{2}{7}-4\dfrac{2}{7}\right)-3\dfrac{4}{9}\)
B= \(\left(10\dfrac{2}{9}-6\dfrac{2}{9}\right)+2\dfrac{3}{5}\)
Bài 2. Tính
a) \(5\dfrac{1}{2}.3\dfrac{1}{4}\) b) \(6\dfrac{1}{3}:4\dfrac{2}{9}\) c) \(4\dfrac{3}{7}.2\)