14*(1/2)^2+13*1/2 5*(1/5)^2+14*1/5

14*(1/2)^2+13*1/2 =17.1) (1/2)^2 = 1 /2 × 1/ 2 = 1·1/ 2·2 = 1/ 4 .2) 14 × 1/ 4 = 14·1/ 4 = 14/ 4 = 7·2/ 2·2 = 7/ 2 = 1 + 3·2/ 2 = 3 1/ 2 .3) 3 1 /2 + 13 1/ 2 = 16 + 1/ 2 + 1/ 2 = 16 + 1 + 1/ 2 = 16 2 /2 = 16 + 1 = 17.5*(1/5)^2+14*1/5 = 3.1) (1/5)^2 = 1 /5 × 1/ 5 = 1·1/ 5·5 = 1/ 25.2) 5 × 1 /25 = 5·1/ 25 = 5/ 25 = 1·5 /5·5 = 1/ 5 .3) 14 × 1 /5 = 14/ 5 = 2 4/ 5.4)2 4/ 5 + 1 /5 = 2 + 4 /5 + 1/ 5 = 2 + 4 + 1/ 5 = 2 5 /5 = 2 + 1 = 3.