12. 13+1/3+х=24+5/21
х=11+5/21-1/3=11+5/21-7/21=11-2/21=10 19/21 Ответ: В
13. 10 2/9 + 15 1/3 + 6 3/10 + 8 1/6 = 10 2/9 + 15 3/9 + 6 9/30 + 8 5/30= 25 5/9 + 14 14/30= 39 + 50/90+42/90= 39 + 92/90 = 40 2/90
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12. 13+1/3+х=24+5/21
х=11+5/21-1/3=11+5/21-7/21=11-2/21=10 19/21 Ответ: В
13. 10 2/9 + 15 1/3 + 6 3/10 + 8 1/6 = 10 2/9 + 15 3/9 + 6 9/30 + 8 5/30= 25 5/9 + 14 14/30= 39 + 50/90+42/90= 39 + 92/90 = 40 2/90