2\5 + 0,3 + (0,8-1\2)
0,9 : 1\5 +1\3-3\5
(1:0,3-2 1\3)-5\6
3 4\9-1 2\3 *1,8
4,5*5 5\9 +6,4 * 3\8
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2\5 + 0,3 + (0,8-1\2) = 0,4+0,3 + (0,8-0,5)= 0,7 + 0,3= 1
0,9 : 1\5 +1\3-3\5 = 0,9 : 0,2 + 5/15-9/15= 4,5 - 4/15 = 4 5/10 - 4/15 = 4 1/2 - 4/15 = 4 15/30 - 8/30= 4 7/30
(1:0,3-2 1\3)-5\6 = (1 * 10/3 - 2 1/3 ) - 5/6 = (10/3 - 7/3) - 5/6 = 3/3 - 5/6 = 1 -5/6 = 1/6
3 4\9-1 2\3 *1,8 = 3 4/9 - 5/3 * 1 8/10= 3 4/9 - 5/3 * 18/10 = 3 4/9 - 1/3 =3 4/9 - 3/9 = 3 1/9
4,5*5 5\9 +6,4 * 3\8 = 4 5/10 * 50/9 + 6 4/10 * 3/8 = 45/10 * 50/9 + 64/10 * 3/8 = 25 + 12/5 = 27 2/5