Tính nhanh 5/9-(10/18+27/8)+47/8 (5/8-3/7)-(3/8-2/7)

2 bình luận về “Tính nhanh 5/9-(10/18+27/8)+47/8 (5/8-3/7)-(3/8-2/7)”

1. Giải đáp:

    \frac{5}{9}-(\frac{10}{18}+\frac{27}{8})+\frac{47}{8}

   =\frac{5}{9}-\frac{5}{9}-\frac{27}{8}+\frac{47}{8}

   =(\frac{5}{9}-\frac{5}{9})+(\frac{47}{8}-\frac{27}{8})

   =0+\frac{20}{8}

   =\frac{5}{2}

   _____________________

   (\frac{5}{8}-\frac{3}{7})-(\frac{3}{8}-\frac{2}{7})

   =\frac{5}{8}-\frac{3}{7}-\frac{3}{8}+\frac{2}{7}

   =(\frac{5}{8}-\frac{3}{8})-(\frac{3}{7}-\frac{2}{7})

   =\frac{2}{8}-\frac{1}{7}

   =\frac{1}{4}-\frac{1}{7}

   =\frac{7}{28}-\frac{4}{28}

   =\frac{3}{28}

   #dyna

    

   Trả lời
2. 5/9-(10/18+27/8)+47/8

   =5/9-10/8+27/8+47/8

   =\frac{5}{9}-\frac{5}{9}-\frac{27}{8}+\frac{47}{8}

   =0+ 20/8

   =5/2

   _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

   (\frac{5}{8}-\frac{3}{7})-(\frac{3}{8}-\frac{2}{7})

   =\frac{5}{8}-\frac{3}{7}-\frac{3}{8}+\frac{2}{7}

   =(\frac{5}{8}-\frac{3}{8})-(\frac{3}{7}-\frac{2}{7})

   =1/4-1/7

   =3/28

   Trả lời