ВЫПОЛНИТЕ УМНОЖЕНИЕ : а) 5 1\6*6 б) 2 2\7*7 в) 11

а) 5 1/6 * 6 = 31/6 * 6 = 186/6 = 31.
    5 1/6 = (5 * 6 + 1)/6 = 31/6.
б) 2 2/7 * 7 = 16/7 * 7 = 112/7 = 16.
    2 2/7 = (2 * 7 + 2)/7 = 16/7.
в) 11 1/8 * 4 = 89/8 * 4 = 356/8 на 4 = 89/2.
    11 1/8 = (11 * 8 + 1)/8 = 89/8.
г) 6 1/9 * 18 = 55/9 * 18 = 990/9 = 110.
    6 1/9 = (6 * 9 + 1)/9 = 55/9.
д) (5/8 + 3/16) * 16 = 13/16 * 16 = 208/16 = 13.
    5/8 + 3/16 = 10/16 + 3/16 = 13/16.
е) (8/21 - 3/14) * 42 = 1/6 * 42 = 7.
    8/21 - 3/14 = 16/42 - 9/42 = 7/42 на 7 = 1/6.

А) 7/9 * 33/43 + 2/9 * 33/43 = 33/43 * (7/9 + 2/9) = 33/43 * 1 = 33/43.
Б) 7 1/12 * 4 1/2 + 4 1/2 * 11/12 = 4 1/2 * (7 1/12 + 11/12) = 9/2 * 96/12 = 72/2 = 36.
    4 1/2 = (4 * 2 + 1)/2 = 9/2.
    7 1/12 = (7 * 12 + 1)/12 = 85/12.
    96/12 = 8.
В) 3 4/9 * 4 3/4 - 3 4/9 * 2 1/2 = 3 4/9 * (4 3/4 - 2 1/2) = 31/9 * (19/4 - 5/2) = 31/9 * 9/4 =    279/36 на 9 = 31/4 = 7 3/4.
    3 4/9 = (3 * 9 + 4)/9 = 31/9.
    4 3/4 = (4 * 4 + 3)/4 = 19/4.
    2 1/2 = (2 * 2 + 1)/2 = 5/2.
 19/4 - 5/2 = 19/4 - 10/4 = 9/4.
Г) ( 13 - 7 5/7) * 7 = 91 - 54 = 37.
    7 5/7 = (7 * 7 + 5)/7 = 54/7.