Question

Đã trả lời bởi chuyên gia

Answer 1

$\frac{2}{3} - \frac{2}{7} = \frac{14}{21} - \frac{6}{21} = \frac{8}{21} \frac{1}{2} + \frac{1}{3} + \frac{1}{6} = \frac{3}{6} + \frac{2}{6} + \frac{1}{6} = \frac{6}{6} = 1 \frac{5}{12} + \frac{5}{6} - \frac{3}{4} = \frac{5}{12} + \frac{10}{12} - \frac{9}{12} = \frac{5 + 10 - 9}{12} = \frac{6}{12} = \frac{1}{2} 1 - (\frac{1}{5} + \frac{1}{2}) = 1 - (\frac{2}{10} + \frac{5}{10}) = 1 - \frac{7}{10} = \frac{10}{10} - \frac{7}{10} = \frac{3}{10}$ .

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Answer 2

$\frac{2}{3} - \frac{2}{7} = \frac{14}{21} - \frac{6}{21} = \frac{8}{21} \frac{1}{2} + \frac{1}{3} + \frac{1}{6} = \frac{3}{6} + \frac{2}{6} + \frac{1}{6} = \frac{6}{6} = 1 \frac{5}{12} + \frac{5}{6} - \frac{3}{4} = \frac{5}{12} + \frac{10}{12} - \frac{9}{12} = \frac{5 + 10 - 9}{12} = \frac{6}{12} = \frac{1}{2} 1 - (\frac{1}{5} + \frac{1}{2}) = 1 - (\frac{2}{10} + \frac{5}{10}) = 1 - \frac{7}{10} = \frac{10}{10} - \frac{7}{10} = \frac{3}{10}$ .

Answer 3

hd

$\frac{2}{3} - \frac{2}{7} = \frac{2 \times 7}{3 \times 7} - \frac{2 \times 3}{7 \times 3} = \frac{14}{21} - \frac{6}{21} = \frac{14 - 6}{21} = \frac{8}{21} \frac{1}{2} + \frac{1}{3} + \frac{1}{6} = \frac{1 \times 3}{2 \times 3} + \frac{1 \times 2}{3 \times 2} + \frac{1}{6} = \frac{3}{6} + \frac{2}{6} + \frac{1}{6} = \frac{3 + 2 + 1}{6} = \frac{6}{6} = 1 \frac{5}{12} + \frac{5}{6} - \frac{3}{4} = \frac{5}{12} + \frac{5 \times 2}{6 \times 2} - \frac{3 \times 3}{4 \times 3} = \frac{5}{12} + \frac{10}{12} - \frac{9}{12} = \frac{5 + 10 - 9}{12} = \frac{6}{12} = \frac{1}{2} 1 - (\frac{1}{5} + \frac{1}{2}) = 1 - (\frac{2 \times 1}{5 \times 2} + \frac{1 \times 5}{2 \times 5}) = 1 - (\frac{2}{10} + \frac{5}{10}) = 1 - \frac{7}{10} = \frac{10}{10} - \frac{7}{10} = \frac{3}{10}$

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Answer 4

hd

$\frac{2}{3} - \frac{2}{7} = \frac{2 \times 7}{3 \times 7} - \frac{2 \times 3}{7 \times 3} = \frac{14}{21} - \frac{6}{21} = \frac{14 - 6}{21} = \frac{8}{21} \frac{1}{2} + \frac{1}{3} + \frac{1}{6} = \frac{1 \times 3}{2 \times 3} + \frac{1 \times 2}{3 \times 2} + \frac{1}{6} = \frac{3}{6} + \frac{2}{6} + \frac{1}{6} = \frac{3 + 2 + 1}{6} = \frac{6}{6} = 1 \frac{5}{12} + \frac{5}{6} - \frac{3}{4} = \frac{5}{12} + \frac{5 \times 2}{6 \times 2} - \frac{3 \times 3}{4 \times 3} = \frac{5}{12} + \frac{10}{12} - \frac{9}{12} = \frac{5 + 10 - 9}{12} = \frac{6}{12} = \frac{1}{2} 1 - (\frac{1}{5} + \frac{1}{2}) = 1 - (\frac{2 \times 1}{5 \times 2} + \frac{1 \times 5}{2 \times 5}) = 1 - (\frac{2}{10} + \frac{5}{10}) = 1 - \frac{7}{10} = \frac{10}{10} - \frac{7}{10} = \frac{3}{10}$

Answer 5

8/21 1 1/2

Answer 6

2/3 - 2/7 = 14/21 - 6/21 = 8/21

1/2 + 1/3 + 1/6 = 3/6 + 2/6 + 1/6 = 6/6 = 1

5/12 + 5/6 - 3/4 = 5/12 + 10/12 - 9/12 = 6/12 = 1/2

1- (1/5 + 1/2) = 1- (2/10 + 5/10) = 1- 7/10 = 10/10 - 7/10 = 3/10

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