Ответ:

Пошаговое объяснение:

2 .  6 1/5 *4 = ( 6 + 1/5 )*4 = 6*4 + 1/5 *4 = 24 + 4/5 = 24 4/5 ;

      9 2/7 * 2 = ( 9 + 2/7 )*2 = 9*2 + 2/7 *2 = 18 + 4/7 = 18 4/7 ;

3 .  3* 7 1/4 = 3*( 7 + 1/4 ) = 3*7 + 3 * 1/4  = 21 + 3/4 = 21 3/4 ;

     6* 1 1/7 = 6*( 1 + 1/7 ) = 6*1 + 6* 1/7 = 6 + 6/7 = 6 6/7 .

4 .  1 1/9 *18 = ( 1 + 1/9 )*18 = 1*18 + 1/9 *18 = 18 + 2 = 20 ;

     3 2/7 * 7 = ( 3 + 2/7 )*7 = 3*7 + 2/7 *7 = 21 + 2 = 23 ;

     2 2/5 *5 = ( 2 + 2/5 )*5 = 2*5 + 2/5 *5 = 10 + 2 = 12 ;

     5 5/6 *6 = ( 5 + 5/6 )*6 = 5*6 + 5/6 *6 = 30 + 5 = 35 ;

     7 2/9 *9 = ( 7 + 2/9 )*9 = 7*9 + 2/9 *9 = 63 + 2 = 65 ;

     4 3/5 *15 = ( 4 + 3/5 )*15 = 4*15 + 3/5 *15 = 60 + 9 = 69.