Помогите пожалуйста решить 3 целых 2\5 плюс 6 целых 5\4 2целых 5\9 плюс 3 целых 4\7 4...

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$3 \frac{2}{5} + 6 \frac{5}{4} = 9 \frac{2 \times 4 + 5 \times 5}{20} = 9 \frac{8 + 25}{20} = 9 \frac{33}{20} = 10 \frac{13}{20}$
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$2 \frac{5}{9} + 3 \frac{4}{7} = 5 \frac{5 \times 7 + 4 \times 9}{63} = 5 \frac{35 + 36}{63} = 5 \frac{71}{63} = 6 \frac{8}{63}$
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$4 \frac{4}{9} - \frac{4}{9} = 4$
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$7 \frac{3}{16} - 2 \frac{7}{20} = 5 \frac{3 \times 5 - 7 \times 4}{80} = 5 \frac{15 - 28}{80} = 5 - \frac{13}{80} = 4 \frac{80 - 13}{80} = 4 \frac{67}{80}$
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$3 \frac{7}{12} - 1 \frac{2}{15} = 2 \frac{7 \times 5 - 2 \times 4}{60} = 2 \frac{35 - 8}{60} = 2 \frac{27}{60} = 2 \frac{9}{20}$
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$5 \frac{1}{3} - 3 \frac{4}{9} = 2 \frac{3 - 4}{9} = 2 - \frac{1}{9} = 1 \frac{9 - 1}{9} = 1 \frac{8}{9}$
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$3 \frac{2}{5} - 2 \frac{6}{7} = 1 \frac{2 \times 7 - 6 \times 5}{35} = 1 \frac{14 - 30}{35} = 1 - \frac{16}{35} = \frac{35 - 16}{35} = \frac{19}{35}$