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\(-\frac{1}{7}.\left(9\frac{1}{2}-8,75\right):\frac{2}{7}+0,625:1\frac{2}{3}\)
\(=-\frac{1}{7}.\left(\frac{19}{2}-\frac{35}{4}\right):\frac{2}{7}+\frac{5}{8}:\frac{5}{3}\)
\(=-\frac{1}{7}.\frac{3}{4}:\frac{2}{7}+\frac{5}{8}:\frac{5}{3}\)
\(=-\frac{3}{8}+\frac{3}{8}\)
\(=0\)
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\(-\frac{1}{7}.\left(9\frac{1}{2}-8,75\right)+0,625:1\frac{2}{3}\)
\(=-\frac{1}{7}.\left(\frac{19}{2}-\frac{35}{2}\right)+\frac{5}{8}:\frac{5}{3}\)
\(=-\frac{1}{7}.\frac{-16}{2}+\frac{5}{8}.\frac{3}{5}\)
\(=\frac{-1}{7}.-8+\frac{3}{8}\)
\(=\frac{8}{7}+\frac{3}{8}\)
\(=\frac{64}{56}+\frac{21}{56}\)
\(=\frac{85}{56}\)
Học tốt !!!
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\(\frac{-1}{7}.\left(9\frac{1}{2}-8,75\right):\frac{2}{7}+0,62:\left(-1\frac{2}{3}\right)\)
\(=\frac{-1}{7}.\left(\frac{19}{2}-\frac{35}{4}\right):\frac{2}{7}+\frac{31}{50}:\left(\frac{-5}{3}\right)\)
\(=\frac{-1}{7}.\frac{3}{4}.\frac{7}{2}-\frac{93}{250}\)
\(=\frac{-3}{8}-\frac{93}{250}\)
\(=\frac{-747}{1000}\)
lưu ý 9 1/2 có nghĩa là 9 và 1/2 nhé