$A$; 5$\frac{2}{7}$ . $\frac{8}{11}$ + 5$\frac{2}{7}$ . $\frac{5}{11}$ – 5$\frac{2}{7}$ . $\frac{2}{11}$ $B$; $\frac{8}{12.13}$ + $\frac{8}{13.14}$ +

Bởi

$A$; 5$\frac{2}{7}$ . $\frac{8}{11}$ + 5$\frac{2}{7}$ . $\frac{5}{11}$ – 5$\frac{2}{7}$ . $\frac{2}{11}$
$B$; $\frac{8}{12.13}$ + $\frac{8}{13.14}$ + … + $\frac{9}{99.100}$

0 bình luận về “$A$; 5$\frac{2}{7}$ . $\frac{8}{11}$ + 5$\frac{2}{7}$ . $\frac{5}{11}$ – 5$\frac{2}{7}$ . $\frac{2}{11}$ $B$; $\frac{8}{12.13}$ + $\frac{8}{13.14}$ +”

  1. A=5/2/7.8/11+5/2/7.5/11-5/2/7.2/11(5/2/7 là hỗn số)

      =5/2/7.(8/11+5/11-2/11)

      =5/2/7.1

      =5/2/7.

    B=8/12.13+8/13.14+….+8/99.100

      =8.(1/12.13+1/13.14+…+1/99/100)

      =8.(1/12-1/13+1/13-1/14+…+1/99-1/100)

      =8.(1/12-1/100)

      =8.(25/300-3/300)

      =8.11/150

      =44/75.

     

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