19/7=2 5/7
402/10=40,2
168/8=21
а) 5/11 - 3/11 + 7/11 = 9/11
б) 9 13/19 + ( 8 18/19 - 3 15/19 ) = 184 / 19 + (170 / 19 - 72 / 19) = 282 / 19
в) 10 4/(21 ) - (4 10/21 + 3 19/21 ) = 214/21 - (94/21+82/21) = 202/21
19/7=2 5/7
402/10=40,2
168/8=21
а) 5/11 - 3/11 + 7/11 = 9/11
б) 9 13/19 + ( 8 18/19 - 3 15/19 ) = 184 / 19 + (170 / 19 - 72 / 19) = 282 / 19
в) 10 4/(21 ) - (4 10/21 + 3 19/21 ) = 214/21 - (94/21+82/21) = 202/21