Tính nhanh
\(5\frac{2}{7}.\frac{8}{11}\)+ \(5\frac{2}{7}.\frac{5}{11}\)-\(5\frac{2}{7}.\frac{2}{11}\)
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a= (\(\frac{2}{5}\)+\(\frac{2}{9}\)+\(\frac{2}{11}\)\(\times\)\(\frac{5}{7}\)\(+\frac{7}{9}\)\(+\frac{7}{11}\)\()\)
\(\frac{5}{7}\).\(\frac{5}{11}\)+\(\frac{5}{7}\).\(\frac{8}{11}\)-\(\frac{5}{7}\).\(\frac{2}{11}\)
=\(\frac{5}{7}\)(\(\frac{5}{11}\)+\(\frac{8}{11}\)-\(\frac{2}{11}\))
=\(\frac{5}{7}\).1
=\(\frac{5}{7}\)
=37/7.8/11+37/7.5/11-37/7.2/11
=37/7.(8/11+5/11-2/11)
=37/7.1=37/7
nếu thấy đúng thì l i k e nhé
1) \(5\frac{2}{7}\).\(\frac{8}{11}\)+\(5\frac{2}{7}.\frac{5}{11}+5\frac{2}{7}.\frac{-2}{11}\)
= \(5\frac{2}{7}\).[\(\frac{8}{11}+\frac{5}{11}+\frac{-2}{11}\)]
= \(5\frac{2}{7}\).1
=\(5\frac{2}{7}\)
2)
5 2/7.8/9+5 2/7.5/11-5 2/7.2/11
=5 2/7.(8/11+5/11+2/11)
=5 2/7.15/11
=240/77.
(67/111+2/33-15/117).(1/3-1/4-1/12)
=811/1221.1/12
=811/14652
\(=\left(\frac{1}{5}-\frac{1}{5}\right)+\left(\frac{3}{7}-\frac{3}{7}\right)+\left(\frac{5}{9}-\frac{5}{9}\right)+\left(\frac{2}{11}-\frac{2}{11}\right)+\left(\frac{7}{13}-\frac{7}{13}\right)+\frac{9}{16}\)
= 0 + \(\frac{9}{16}\)
= \(\frac{9}{16}\)
tick nha bn
\(B=\frac{1}{5}-\frac{3}{7}+\frac{5}{9}-\frac{2}{11}+\frac{7}{13}-\frac{9}{16}-\frac{7}{13}+\frac{2}{11}-\frac{5}{9}+\frac{3}{7}-\frac{1}{5}\)
\(=\left(\frac{1}{5}-\frac{1}{5}\right)+\left(-\frac{3}{7}+\frac{3}{7}\right)+\left(\frac{5}{9}-\frac{5}{9}\right)+\left(-\frac{2}{11}+\frac{2}{11}\right)+\left(\frac{7}{13}-\frac{7}{13}\right)-\frac{9}{16}\)
\(=0+0+0+0+0-\frac{9}{16}\)
\(=-\frac{9}{16}\)
^...^ ^_^
B=(1/5-1/5) + (-3/7+3/7) + (5/9-5/9) + (-2/11+2/11) + (7/13-7/13) - 9/16
= 0 + 0 + 0 + 0 + 0 - 9/16
=-9/16
\(5\frac{2}{7}\).\(\frac{8}{11}+5\frac{2}{7}\).\(\frac{5}{11}-5\frac{2}{7}\).\(\frac{2}{11}\)
=\(5\frac{2}{7}\).\(\)(\(\frac{8}{11}+\frac{5}{11}-\frac{2}{11}\))
=\(5\frac{2}{7}\).1
=\(5\frac{2}{7}\)