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А)
( 5 - 3 7/16 ) + ( 4 - 2 9/16) = 3
1) 5 - 3 7/16 = 5 - 3 = 2 - 7/16 = 1 9/16
2) 4 - 2 9/16 = 4 - 2 = 2 - 9/16 = 1 7/16
3) 1 9/16 + 1 7/16 = 3

б)
( 3 - 1 4/7 ) + ( 5 - 2 5/7 ) = 3 5/7
1) 3 - 1 4/7 = 3 - 1 = 2 - 4/7 = 1 3/7
2) 5 - 2 5/7 = 5 - 2 = 3 - 5/7 = 2 2/7
3) 1 3/7 + 2 2/7 = 3 5/7

в)
( 2 - 1 5/18) + ( 7 - 2 11/18 ) = 5 2/18
1) 2 - 1 5/18 = 2 - 1 = 1 - 5/18 = 13/18
2) 7 - 2 11/18 = 7 - 2 = 5 - 11/18 = 4 7/18
3) 13/18 + 4 7/18 = 13/18 + 7/18 = 20/18 = 1 2/18 + 4 = 1 + 4 = 5 + 2/18 = 5 2/18

г)
( 2 - 1 5/18) + ( 7 - 2 11/18) = 5 2/18
1) 2 - 1 5/18 = 2 - 1 = 1 - 5/18 = 13/18
2) 7 - 2 11/18 = 7 - 2 = 5 - 11/18 = 4 7/18
3) 13/18 + 4 7/18 = 13/18 + 7/18 = 20/18 = 1 2/18 + 4 = 1 + 4 = 5 + 2/18 = 5 2/18

Ответы:

а) 3

б) 3 5/7

в) 5 2/18

г) 5 2/18

а) = 1 9/16 + 1 7/16 = 2 16/16 = 3

б) = 1 3/7 + 2 2/7 = 3 5/7

в) = 13/18 + 4 7/18 = 4 20/18 = 5 2/18 = 5 1/9