(1 3/5 + 1,8) * 1/2 = 1,7
1) 1 3/5 + 1,8 = 1 3/5 + 1 8/10 = 1 3/5 + 1 4/5 = 2 7/5 = 3 2/5
2) 3 2/5 * 1/2 = 17/5 * 1/2 = 17/10 = 1,7
(6 - 4 8/15) : 2,2 = 2/3
1) 6 - 4 8/15 = 5 15/15 - 4 8/15 = 1 7/15
2) 1 7/15 : 2,2 = 22/15 : 22/10 = 22/15 * 10/22 = 1/3 * 2/1 = 2/3
(1,25 + 1/6) * 2,4 = 3,4
1) 1,25 + 1/6 = 1 25/100 + 1/6 = 1 1/4 + 1/6 = 1 3/12 + 2/12 = 1 5/12
2) 1 5/12 * 2,4 = 17/12 * 24/10 = 17/1 * 2/10 = 34/10 = 3,4
(5,4 - 2 1/3) : 7 2/3 = 2/5 = 0,4
1) 5,4 - 2 1/3 = 5 4/10 - 2 1/3 = 5 2/5 - 2 1/3 = 5 6/15 - 2 5/15 = 3 1/15
2) 3 1/15 : 7 2/3 = 46/15 : 23/3 = 46/15 * 3/23 = 2/5 * 1/1 = 2/5
(2 1/3 + 0,25) * 0,12 = 0,31
1) 2 1/3 + 0,25 = 2 1/3 + 25/100 = 2 1/3 + 1/4 = 2 4/12 + 3/12 = 2 7/12
2) 2 7/12 * 0,12 = 31/12 * 12/100 = 31/100 = 0,31
(7,6 - 4 3/4) : 1,9 = 1,5
1) 7,6 - 4 3/4 = 7 6/10 - 4 3/4 = 7 3/5 - 4 3/4 = 7 12/20 - 4 15/20 = 6 32/20 - 4 15/20 = 2 17/20
2) 2 17/20 : 1,9 = 57/20 : 19/10 = 57/20 * 10/19 = 3/2 * 1/1 = 3/2 = 1,5