1) 1,6 +(5 + 3,4) 2) (2,41+ 13) + 4, 59
1) 1,6 +(5 + 3,4) =10 2) (2,41+ 13) + 4, 59 =20
1)5+3,4=8,4+1,6=10; 2)2,41+13=15,41+4,59=20.