-1/2-1/4=-( 1/2 + 1/4) = - ( 2/4 + 1/4)=3/4
3) -7/10-3/5= -(7/10 + 3/5) = -( 10/70 + 14/70) = 24/70
Ответ будет таков 458,986
(11 2/11 + х) - 5 4/11 = 8 8/11
(11 2/11 + х) = 8 8/11 + 5 4/11
(11 2/11 + х) = 14 1/11
Х = 14 1/11 - 11 2/11
Х = 13 12/11 - 11 2/11
Х = 2 10/11
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Ответ: х = 2 10/11