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28 tháng 6 2017

\(\dfrac{12,48:0,5.6,25.4.2}{2.3,14.1,25:0,25.10}\)

= \(\dfrac{12,48.2.5.4.2}{2.3,14.1.4.10}\)

= \(\dfrac{12,48.2}{2.3,14}\) = \(\dfrac{12,48}{3,14}\) = \(\dfrac{6,24}{1,57}\)

28 tháng 6 2017

Nếu sai mong bn thông cảm

23 tháng 7 2023

12,48: 0,5 \(\times\) 6,25 \(\times\) 4 \(\times\) 2

= 12,48 \(\times\) 2 \(\times\) 2 \(\times\) (6,25 \(\times\) 4) 

= 12,48 \(\times\)\(\times\) 25

= 12,48 \(\times\) 100

= 1248

23 tháng 7 2023

12,48:0,5x6,25x4x2=24,96x6,25x4x2=24,96x(6,25x4x2)

                                                           =(24,96x100):2

                                                          =2496:2=1248

9 tháng 8 2015

\(\frac{12,48:0,5.6,25.4.2}{2.3,12.1,25:0,25.10}\)\(\frac{12,48.2.6.25.4.2}{2.3,12.1,25.4.10}\)\(\frac{3,12.4.2.1,25.5.4.2}{2.3,12.1,25.4.5.2}\)= \(4\) 

12 tháng 2 2018

\(\frac{\text{12,48:0,5.6,25.4.2 }}{2.3,12.1,25:0,25.10}=\frac{12,48.2.6.25.4.2}{2.3,12.1,25.4.10}=\frac{\text{3,12.4.2.1,25.5.4.2}}{\text{2.3,12.1,25.4.5.2}}=4\)

Tính nhanh , bài nhiều TvT1 ) ( 30 : 7\(\frac{1}{2}\)+ 0,5 . 3 - 1,5 ) . ( \(4\frac{1}{2}-\frac{9}{2}\)) : ( 14,5 . 100 )2 ) \(\frac{1999.2001-1}{1998+1999.2000}.\frac{7}{5}\)3 ) \(\frac{1978.1979+1980.21+1985}{1980.1979-1978.1979}\)4 ) \(\frac{12,48:0,5.6,25.4.2}{2.3,12.1,25:0,25.10}\)5 ) \(\frac{19,8:0,2.44,44.2.13,2:0,23}{3,3.88,88:0,5.6,6:0,125.5}\)6 ) \(\frac{1+3+6+10+...+45+55}{1.10+2.9+3.8+...+8.3+9.2+10.1}\)7...
Đọc tiếp

Tính nhanh , bài nhiều TvT

1 ) ( 30 : 7\(\frac{1}{2}\)+ 0,5 . 3 - 1,5 ) . ( \(4\frac{1}{2}-\frac{9}{2}\)) : ( 14,5 . 100 )

2 ) \(\frac{1999.2001-1}{1998+1999.2000}.\frac{7}{5}\)

3 ) \(\frac{1978.1979+1980.21+1985}{1980.1979-1978.1979}\)

4 ) \(\frac{12,48:0,5.6,25.4.2}{2.3,12.1,25:0,25.10}\)

5 ) \(\frac{19,8:0,2.44,44.2.13,2:0,23}{3,3.88,88:0,5.6,6:0,125.5}\)

6 ) \(\frac{1+3+6+10+...+45+55}{1.10+2.9+3.8+...+8.3+9.2+10.1}\)

7 ) \(\frac{5}{1.5.8}+\frac{5}{5.8.12}+\frac{5}{8.12.15}+...+\frac{5}{33.36.40}\)

8 ) \(\frac{1}{4}+\frac{1}{24}+\frac{1}{124}\)                                              \(\frac{2}{7}+\frac{2}{17}+\frac{2}{127}\)

________________________               +                   ____________________________      ( Đây là phân số )

\(\frac{3}{4}+\frac{3}{24}+\frac{3}{124}\)                                                \(\frac{3}{7}+\frac{3}{17}+\frac{3}{127}\)

9 ) \(\left(1+\frac{1}{3}\right).\left(1+\frac{1}{8}\right).\left(1+\frac{1}{15}\right).\left(1+\frac{1}{24}\right).\left(1+\frac{1}{35}\right)\)

10 ) \(\frac{3}{4}.\frac{8}{9}.\frac{15}{16}.\frac{24}{25}..............\frac{9999}{10000}\)

11 ) \(\frac{1}{51}+\frac{1}{52}+...+\frac{1}{100}\)

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\(\frac{1}{1.2}+\frac{1}{3.4}+...+\frac{1}{99.100}\)

12 ) \(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{100}\)

_________________________________________

\(\frac{1}{99}+\frac{2}{98}+\frac{3}{97}+...+\frac{98}{2}+\frac{99}{1}\)

1
13 tháng 8 2016

tớ sẽ giúp bạn giải phần 8:\                                                                                                                                                          

1/4 +1/24 +1/124                                            2 x  [   1/7 +1/17 +1/127]                                                                                               ______________                                   +       _________________         =1/3 +2/3=1                                                                        3 x[1/4 +1/24 +1/124]                                     3 x [1/7 +1/17 +1/127]

22 tháng 9 2023

\(\dfrac{\dfrac{\dfrac{9}{9}}{\dfrac{9}{9}}}{\dfrac{\dfrac{9}{9}}{\dfrac{9}{9}}}\) + \(\dfrac{\dfrac{\dfrac{9}{9}}{\dfrac{9}{9}}}{\dfrac{\dfrac{9}{9}}{\dfrac{9}{9}}}\) = 1 + 1 = 2

23 tháng 4 2023

1) \(\dfrac{1}{2}+\dfrac{13}{19}-\dfrac{4}{9}+\dfrac{6}{19}+\dfrac{5}{18}\)

\(=\dfrac{1}{2}+\left(\dfrac{13}{19}+\dfrac{6}{19}\right)-\dfrac{4}{9}+\dfrac{5}{18}\)

\(=\dfrac{3}{2}-\dfrac{4}{9}+\dfrac{5}{18}\)

\(=\dfrac{19}{18}+\dfrac{5}{18}\)

\(=\dfrac{24}{18}\)

\(=\dfrac{4}{3}\)

2) \(\dfrac{-20}{23}+\dfrac{2}{3}-\dfrac{3}{23}+\dfrac{2}{5}+\dfrac{7}{15}\)

\(=\left(-\dfrac{20}{23}-\dfrac{3}{23}\right)+\dfrac{2}{3}+\dfrac{2}{5}+\dfrac{7}{15}\)

\(=-1+\dfrac{2}{3}+\dfrac{2}{5}+\dfrac{7}{15}\)

\(=-\dfrac{1}{3}+\dfrac{2}{5}+\dfrac{7}{15}\)

\(=\dfrac{1}{15}+\dfrac{7}{15}\)

\(=\dfrac{8}{15}\)

3) \(\dfrac{4}{3}+\dfrac{-11}{31}+\dfrac{3}{10}-\dfrac{20}{31}-\dfrac{2}{5}\)

\(=\left(\dfrac{-11}{31}-\dfrac{20}{31}\right)+\dfrac{4}{3}+\dfrac{3}{10}-\dfrac{2}{5}\)

\(=-1+\dfrac{4}{3}+\dfrac{3}{10}-\dfrac{2}{5}\)

\(=\dfrac{1}{3}+\dfrac{3}{10}-\dfrac{2}{5}\)

\(=\dfrac{1}{3}-\dfrac{1}{10}\)

\(=\dfrac{7}{30}\)

4) \(\dfrac{5}{7}.\dfrac{5}{11}+\dfrac{5}{7}.\dfrac{2}{11}-\dfrac{5}{7}.\dfrac{14}{11}\)

\(=\dfrac{5}{7}.\left(\dfrac{5}{11}+\dfrac{2}{11}-\dfrac{14}{11}\right)\)

\(=\dfrac{5}{7}.-\dfrac{7}{11}\)

\(=-\dfrac{35}{77}\)

\(=-\dfrac{5}{11}\)