1)1/2-1/3-1/4=? 2)2/3-1/4-1/6=? 3)1/8-1/4-1/2=?

если непонятно спроси

1) 1/2 -1/3 -1/4 = -1/121/2 = 6/12. 1/3 = 4/12. 1/4 = 3/126/12 - 4/12 - 3/12 = -1/122) 2/3 - 1/4 - 1/6 = 1/42/3 = 8/12. 1/4 = 3/12. 1/6 = 2/128/12 - 3/12 - 2/12 = 3/12 = 1/43) 1/8 -1/4-1/2 = -5/81/8 = 2/16. 1/4 = 4/16. 1/2 = 8/162/16 - 4/16 - 8/16 = -10/16 = -5/8