Question

Calculaţi:
a) 1,4 - 0,(5) : 2
b) 7 supra 5 + 0,(81) + 3^2 x (5 - 4 x 1 supra 8)

Answer 1

a) 1,4 - 0,(5) : 2=14/10 -(5/9)/2=7/5 -5/18=(7x18 -5x5)/90=101/90

b) 7 supra 5 + 0,(81) + 3^2 x (5 - 4 x 1 supra 8)=

=7/5 +81/99 +9x(5- 1/2)=7/5 +9/11 +9x9/2=7/5 +9/11+ 81/2=

=(22x7 +10x9 +55x81)/110=4699/110

Answer 2

14/10-5/9:2=14/10-5/9*1/2= 14/10 - 5/18= 126-25/180 =101/180