Dau coroană!!!Ajutor repede!!!

a)3,7×(2,59+2,41)=
3,7×5=18,5
b)6,12×(4,23-4,03)=
6,12×0,2=1,224
c)(12,5+2,5)×(10-0,9)=
15×9,1=136,5
d)(6,12-5,93)×(78,124+21,876)=
0,19×100=19