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1) ![6: frac{3}{5} =6 * frac{5}{3} = 10 6: frac{3}{5} =6 * frac{5}{3} = 10](https://tex.z-dn.net/?f=6%3A+frac%7B3%7D%7B5%7D+%3D6+%2A+frac%7B5%7D%7B3%7D+%3D+10)
2)![1 frac{1}{6} * frac{6}{7}= frac{7}{6} * frac{6}{7}= 1 1 frac{1}{6} * frac{6}{7}= frac{7}{6} * frac{6}{7}= 1](https://tex.z-dn.net/?f=1+frac%7B1%7D%7B6%7D+%2A+frac%7B6%7D%7B7%7D%3D+frac%7B7%7D%7B6%7D+%2A+frac%7B6%7D%7B7%7D%3D+1++)
3)![10-1=9 10-1=9](https://tex.z-dn.net/?f=10-1%3D9)
4)![4 frac{1}{5}* frac{10}{11}= frac{21}{5} * frac{10}{11} = frac{42}{11} 4 frac{1}{5}* frac{10}{11}= frac{21}{5} * frac{10}{11} = frac{42}{11}](https://tex.z-dn.net/?f=4+frac%7B1%7D%7B5%7D%2A+frac%7B10%7D%7B11%7D%3D+frac%7B21%7D%7B5%7D+%2A+frac%7B10%7D%7B11%7D+%3D+frac%7B42%7D%7B11%7D+++)
![=3 frac{9}{11} =3 frac{9}{11}](https://tex.z-dn.net/?f=%3D3+frac%7B9%7D%7B11%7D+)
5)![3 frac{9}{11} +5 frac{2}{11}=8 frac{11}{11} = 9 3 frac{9}{11} +5 frac{2}{11}=8 frac{11}{11} = 9](https://tex.z-dn.net/?f=3+frac%7B9%7D%7B11%7D+%2B5+frac%7B2%7D%7B11%7D%3D8+frac%7B11%7D%7B11%7D+%3D+9+)
6)![frac{3}{20}+ frac{1}{2} - frac{1}{15}= frac{9+30-4}{60}= frac{35}{60}= frac{7}{12} frac{3}{20}+ frac{1}{2} - frac{1}{15}= frac{9+30-4}{60}= frac{35}{60}= frac{7}{12}](https://tex.z-dn.net/?f=+frac%7B3%7D%7B20%7D%2B+frac%7B1%7D%7B2%7D+-+frac%7B1%7D%7B15%7D%3D+frac%7B9%2B30-4%7D%7B60%7D%3D+frac%7B35%7D%7B60%7D%3D+frac%7B7%7D%7B12%7D+++++)
7)![frac{7}{12}* frac{12}{49}= frac{1}{7} frac{7}{12}* frac{12}{49}= frac{1}{7}](https://tex.z-dn.net/?f=+frac%7B7%7D%7B12%7D%2A+frac%7B12%7D%7B49%7D%3D+frac%7B1%7D%7B7%7D+++)
8)![frac{1}{5}+ frac{1}{7}= frac{7+5}{35}= frac{12}{35} frac{1}{5}+ frac{1}{7}= frac{7+5}{35}= frac{12}{35}](https://tex.z-dn.net/?f=+frac%7B1%7D%7B5%7D%2B+frac%7B1%7D%7B7%7D%3D+frac%7B7%2B5%7D%7B35%7D%3D+frac%7B12%7D%7B35%7D++++)
9)![frac{1}{7} : frac{12}{35}= frac{1}{7}* frac{35}{12} = frac{5}{12} frac{1}{7} : frac{12}{35}= frac{1}{7}* frac{35}{12} = frac{5}{12}](https://tex.z-dn.net/?f=+frac%7B1%7D%7B7%7D+%3A+frac%7B12%7D%7B35%7D%3D+frac%7B1%7D%7B7%7D%2A+frac%7B35%7D%7B12%7D+%3D+frac%7B5%7D%7B12%7D+++)
10)![1 - frac{5}{12}= frac{12}{12}- frac{5}{12}= frac{7}{12} 1 - frac{5}{12}= frac{12}{12}- frac{5}{12}= frac{7}{12}](https://tex.z-dn.net/?f=1+-++frac%7B5%7D%7B12%7D%3D+frac%7B12%7D%7B12%7D-+frac%7B5%7D%7B12%7D%3D+frac%7B7%7D%7B12%7D++)
11)![frac{7}{12} *2 frac{1}{3} = frac{7}{12}* frac{7}{3} = frac{49}{36}= 1 frac{13}{36} frac{7}{12} *2 frac{1}{3} = frac{7}{12}* frac{7}{3} = frac{49}{36}= 1 frac{13}{36}](https://tex.z-dn.net/?f=+frac%7B7%7D%7B12%7D+%2A2+frac%7B1%7D%7B3%7D+%3D++frac%7B7%7D%7B12%7D%2A+frac%7B7%7D%7B3%7D++%3D+frac%7B49%7D%7B36%7D%3D+1+frac%7B13%7D%7B36%7D++)
12)![3 frac{1}{4} -1 frac{13}{36}= 3 + frac{1}{4}-1- frac{13}{36}=(3-1)+( frac{1}{4}- frac{13}{36})=2+ frac{9-13}{36}= 2- frac{4}{36} = 3 frac{1}{4} -1 frac{13}{36}= 3 + frac{1}{4}-1- frac{13}{36}=(3-1)+( frac{1}{4}- frac{13}{36})=2+ frac{9-13}{36}= 2- frac{4}{36} =](https://tex.z-dn.net/?f=3+frac%7B1%7D%7B4%7D+-1+frac%7B13%7D%7B36%7D%3D+3+%2B++frac%7B1%7D%7B4%7D-1-+frac%7B13%7D%7B36%7D%3D%283-1%29%2B%28+frac%7B1%7D%7B4%7D-+frac%7B13%7D%7B36%7D%29%3D2%2B+frac%7B9-13%7D%7B36%7D%3D+2-+frac%7B4%7D%7B36%7D+%3D++++++)
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