Question

Calculati: [1 supra 3 +1 supra 3 : (1 - 1 supra 3)] : 3 supra 2; 28 supra 31 x [ ! supra 4 + (2 intregi 1 supra 2 - 7 supra 4 ): 7 supra 8].

Answer 1

[1/3 +1/3 : (1 - 1/3)] : 3/2=
=(1/3 +1/3 : 2/3) : 3/2=
=(1/3 +1/3 ×3/2) ×2/3=
=(1/3 +1/2) ×2/3=
=(2+3)/6 ×2/3=
=5/3 ×1/3=5/9
 
28/31 x [ 1/4 + (2 intregi 1/2 - 7/4 ): 7/8]=
=28/31 x [ 1/4 + (5/2 - 7/4 ) ×8/7]=
=28/31 x [ 1/4 + (10- 7)/4 ) ×8/7]=
=28/31 x ( 1/4 + 3/4 ×8/7)=
=28/31 x ( 1/4 + 6/7)=
=28/31 x ( 7+24)/28=
=28/31 x 31/28=1