a) 20,7 + 1,47 : 7 – 0,23 . 5 b)1 4/5.7/8+4/29:5/58-1 3/10 c)5 2/7.8/11+5 2/7.5/11-5 2/7.2/11

0 bình luận về “a) 20,7 + 1,47 : 7 – 0,23 . 5 b)1 4/5.7/8+4/29:5/58-1 3/10 c)5 2/7.8/11+5 2/7.5/11-5 2/7.2/11”

1. a) 20.7 + 1.47÷7 – 0.23×5 = 20.7 + 0.21 – 1.15 = 19.76

   b) 1$\frac{4}{5}$ × $\frac{7}{8}$ + $\frac{4}{29}$ ÷ $\frac{5}{58}$ – 1$\frac{3}{10}$

   = $\frac{9}{5}$ × $\frac{7}{8}$ + $\frac{4}{29}$ × $\frac{58}{5}$ – $\frac{13}{10}$

   = $\frac{63}{40}$ + $\frac{8}{5}$ – $\frac{10}{10}$

   = $\frac{63 + 64 – 52}{40}$

   = $\frac{75}{40}$ = $\frac{15}{8}$

   c) 5$\frac{2}{7}$ × $\frac{8}{11}$ + 5$\frac{2}{7}$ × $\frac{5}{11}$ – 5$\frac{2}{7}$ × $\frac{2}{11}$

   = 5$\frac{2}{7}$ × ($\frac{8}{11}$ + $\frac{5}{11}$ – $\frac{2}{11}$)

   = $\frac{37}{7}$ × $\frac{11}{11}$

   = $\frac{37}{7}$ × 1

   = $\frac{37}{7}$

   Trả lời

2. a) 20,7 + 1,47 : 7 – 0,23.5

   = 20,7 + 0,21 – 1,15

   = 20,91 – 1,15

   = 19,76

   b)1$\frac{4}{5}$ .$\frac{7}{8}$ +$\frac{4}{29}$ :$\frac{5}{58}$ -1$\frac{3}{10}$

   =$\frac{9}{5}$ .$\frac{7}{8}$+ $\frac{4}{29}$ .$\frac{58}{5}$ -$\frac{13}{10}$

   =$\frac{63}{40}$ +$\frac{8}{5}$ -$\frac{13}{10}$

   =$\frac{63}{40}$+$\frac{64}{40}$ -$\frac{52}{40}$

   =$\frac{75}{40}$ =$\frac{15}{8}$

   c)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$\frac{2}{7}$.$\frac{11}{11}$

   =5$\frac{2}{7}$=$\frac{37}{7}$

   Chúc bạn học tốt<33

   @Team FA

   Trả lời