4/9 + 3/7 = 3/4 + 7/24 = 1/3 + 2/9 + 4/27 = 5/6 – 3/8 = 7/15 – 11/30 = 2/3 + 1/6 – 7/12 = 18/25 x 15/6 = 30/49 : 6/7 = 1/2 x 3/4 : 6/5 = 8 x 5/3 : 12/

0 bình luận về “4/9 + 3/7 = 3/4 + 7/24 = 1/3 + 2/9 + 4/27 = 5/6 – 3/8 = 7/15 – 11/30 = 2/3 + 1/6 – 7/12 = 18/25 x 15/6 = 30/49 : 6/7 = 1/2 x 3/4 : 6/5 = 8 x 5/3 : 12/”

1. 4/9 + 3/7 = 28/63 + 27/63 = 55/63

   3/4 + 7/24 =18/24 + 7/24 = 25/24

   1/3 + 2/9 + 4/27 = 9/27 + 6/27 + 4/27 =19/27

   5/6 – 3/8 = 20/24 – 9/24 = 11/24

   7/15 – 11/30 = 14/30 -11/30 = 3/30 = 1/10

   2/3 + 1/6 – 7/12 = 8/12 + 2/12 – 7/12 = 3/12 = 1/4

   18/25×15/6 = 45/25 = 9/5 

   30/49 : 6/7= 30/49 ×7/6 = 5/7

   1/2 × 3/4 : 6/5 = 5/16

   8×5/3 : 12/5 = 50/9

   4: 9/5 : 10/3= 2/3

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2. Đáp án:

   $\frac{4}{9}$ + $\frac{3}{7}$ = $\frac{28}{63}$ +$\frac{27}{63}$ = $\frac{55}{63}$ 

   $\frac{3}{4}$ + $\frac{7}{24}$ = $\frac{18}{24}$ + $\frac{7}{24}$ = $\frac{25}{24}$ 

   $\frac{1}{3}$ + $\frac{2}{9}$ + $\frac{4}{27}$ = $\frac{9}{27}$ + $\frac{6}{27}$ + $\frac{4}{27}$ = $\frac{19}{27}$ 

   $\frac{5}{6}$ – $\frac{3}{8}$ = $\frac{20}{24}$ – $\frac{9}{24}$ = $\frac{11}{24}$ 

   $\frac{7}{15}$ – $\frac{11}{30}$ = $\frac{14}{30}$ – $\frac{11}{30}$ = $\frac{3}{30}$ = $\frac{1}{10}$ 

   $\frac{2}{3}$ + $\frac{1}{6}$ – $\frac{7}{12}$ = $\frac{8}{12}$ + $\frac{2}{12}$ – $\frac{7}{12}$ =$\frac{3}{12}$ = $\frac{1}{4}$ 

   $\frac{18}{25}$ × $\frac{15}{6}$ = $\frac{45}{25}$ = $\frac{9}{5}$ 

   $\frac{30}{49}$ : $\frac{6}{7}$ = $\frac{30}{49}$ × $\frac{7}{6}$ = $\frac{5}{7}$ 

   $\frac{1}{2}$ × $\frac{3}{4}$ : $\frac{6}{5}$ = $\frac{1}{2}$ × $\frac{3}{4}$ × $\frac{5}{6}$

   = $\frac{5}{16}$ 

   8 × $\frac{5}{3}$ : $\frac{12}{5}$ = $\frac{8}{1}$ × $\frac{5}{3}$ × $\frac{5}{12}$ = $\frac{50}{9}$ 

   4 : $\frac{9}{5}$ : $\frac{10}{3}$ = $\frac{4}{1}$ × $\frac{5}{9}$ × $\frac{3}{10}$ = $\frac{2}{3}$ 

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