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823
а)![frac{1}{3} * frac{2}{7} = frac{1*2}{3*7} = frac{2}{21} frac{1}{3} * frac{2}{7} = frac{1*2}{3*7} = frac{2}{21}](https://tex.z-dn.net/?f=+frac%7B1%7D%7B3%7D+%2A+frac%7B2%7D%7B7%7D+%3D++frac%7B1%2A2%7D%7B3%2A7%7D+%3D+frac%7B2%7D%7B21%7D++)
б)![frac{1}{2} * frac{5}{6} = frac{5}{12} frac{1}{2} * frac{5}{6} = frac{5}{12}](https://tex.z-dn.net/?f=+frac%7B1%7D%7B2%7D+%2A++frac%7B5%7D%7B6%7D+%3D++frac%7B5%7D%7B12%7D+)
в)![frac{3}{4} * frac{1}{4} = frac{3}{16} frac{3}{4} * frac{1}{4} = frac{3}{16}](https://tex.z-dn.net/?f=+frac%7B3%7D%7B4%7D+%2A++frac%7B1%7D%7B4%7D+%3D++frac%7B3%7D%7B16%7D+)
824
а)![frac{8}{9} * frac{3}{5} = frac{8*3}{9*5} = frac{8*1}{3*5} = frac{8}{15} frac{8}{9} * frac{3}{5} = frac{8*3}{9*5} = frac{8*1}{3*5} = frac{8}{15}](https://tex.z-dn.net/?f=+frac%7B8%7D%7B9%7D+%2A+frac%7B3%7D%7B5%7D+%3D+frac%7B8%2A3%7D%7B9%2A5%7D+%3D+frac%7B8%2A1%7D%7B3%2A5%7D+%3D+frac%7B8%7D%7B15%7D)
б)![frac{9}{2} * frac{2}{9} = frac{9*2}{2*9} = frac{1*1}{1*1} = 1 frac{9}{2} * frac{2}{9} = frac{9*2}{2*9} = frac{1*1}{1*1} = 1](https://tex.z-dn.net/?f=+frac%7B9%7D%7B2%7D+%2A+frac%7B2%7D%7B9%7D+%3D+frac%7B9%2A2%7D%7B2%2A9%7D+%3D+frac%7B1%2A1%7D%7B1%2A1%7D+%3D+1+)
в)![frac{8}{21} * frac{7}{10} = frac{8*7}{21*10} = frac{4*1}{3*5} = frac{4}{15} frac{8}{21} * frac{7}{10} = frac{8*7}{21*10} = frac{4*1}{3*5} = frac{4}{15}](https://tex.z-dn.net/?f=+frac%7B8%7D%7B21%7D+%2A+frac%7B7%7D%7B10%7D+%3D+frac%7B8%2A7%7D%7B21%2A10%7D+%3D+frac%7B4%2A1%7D%7B3%2A5%7D+%3D+frac%7B4%7D%7B15%7D)
825
а)![frac{3}{7} * 2 = frac{6}{7} frac{3}{7} * 2 = frac{6}{7}](https://tex.z-dn.net/?f=+frac%7B3%7D%7B7%7D+%2A+2+%3D+frac%7B6%7D%7B7%7D+)
б)![3 * frac{1}{6} = 1 * frac{1}{2} = frac{1}{2} 3 * frac{1}{6} = 1 * frac{1}{2} = frac{1}{2}](https://tex.z-dn.net/?f=+3+%2A+frac%7B1%7D%7B6%7D+%3D+1+%2A+frac%7B1%7D%7B2%7D+%3D+frac%7B1%7D%7B2%7D+)
в)![9 * frac{5}{6} = 3 * frac{5}{2} = frac{15}{2} 9 * frac{5}{6} = 3 * frac{5}{2} = frac{15}{2}](https://tex.z-dn.net/?f=+9+%2A+frac%7B5%7D%7B6%7D+%3D+3+%2A+frac%7B5%7D%7B2%7D+%3D+frac%7B15%7D%7B2%7D)
г)![frac{2}{5}* 15 = frac{2}{1} * 3 = 6 frac{2}{5}* 15 = frac{2}{1} * 3 = 6](https://tex.z-dn.net/?f=+frac%7B2%7D%7B5%7D%2A+15+%3D+frac%7B2%7D%7B1%7D+%2A+3+%3D+6)
д)![frac{1}{4}* 4 =frac{1}{1} *1= 1 frac{1}{4}* 4 =frac{1}{1} *1= 1](https://tex.z-dn.net/?f=+frac%7B1%7D%7B4%7D%2A+4+%3Dfrac%7B1%7D%7B1%7D+%2A1%3D+1)
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