2.
4 + 15 = 4*4 +15*25 = 16 + 375 = 391 = 3.91
25 4 25*4 100 100
3.
(19 + 11 ) : 5 = (19*3 + 11*2 ) * 48 = 79 * 48 = 79*2 = 158 = 31,6
8 12 48 24 5 24 5 5 5
5.
27 = 27 = 1,35
5*4 20
6. (2 ³/₄ + 2 ¹/₅) 16 = (¹¹/₄ + ¹¹/₅) 16 = ( 11*5+11*4) * 16 =
20
= 99 * 16 = 99*4 = 79,2
20 5