a) (205/100 +175/100) - (1 +2/10) =
380/100 - 12/10 =
380 /100 - 120/100 = 260/100 = 2,6
b) (438/100+252/100) x (34/10 +6/10)=
690 /100 x 40/10= (69 x 4 ) / 10 = 276/10 = 27,6
C)75/100 +1/10 x (28/10 - 11/10) =
75/100 + 17/100 = 92/100 = 0,92
d)(12/10)² + 12/10 x (34/10 +6/10) =
144/100 + 12/10 x 40/10 =
144/100 + 480/100 = 624/100 = 6,24