Question

Calculati in modul cel mai eficient:
a)-3,72+5,26+2,72=
b)2/3+(1/3-5/12)=
c)(0,32-10,56)+10,56=
d)-3,78+9,84+1,78-20,84=

VAROG FRUMOS VA DAU 30 PUNCTE

Answer 1

a) -3,72+5,26+2,72=
    = -1+5,26=4,26
b) 2/3+(1/3-5/12)=
     =2/3+1/3-5/12=
     =3/3-5/12=
     =12/12-5/12=7/12
c) (0,32-10,56)+10,56=
    =0,32-10,56+10,56=0,32
d) -3,78+9,84+1,78-20,84=
    = -2+(-11)= -13
    

Answer 2

a) -3,72 + 5,26 + 2,72 = (-3,72+2,72) + 5,26 = -1 + 5,26 = 4,26
b) 2/3 + (1/3 - 5/12) = (2/3 + 1/3) - 5/12 = 1 - 5/12 = 12/12 - 5/12 = 7/12
c) (0,32 - 10,56) + 10,56 = 0,32 - 10,56 + 10,56 = 0,32 + 0 = 0,32
d) -3,78 + 9,84 + 1,78 - 20,84 = -(3,78 - 1,78) - (20,84 - 9,84) = - 2 - 11 = -13