Răspuns:
1. a = 2
b = 7
c = 5
(a•b)•c = (2•7)•5 = 14•5 = 70
a•(b•c) = 2•(7•5) = 2•35 = 70
a•(b+c) = 2•(7+5) = 2•12 = 24
a•b+a•c = 2•7+2•5 = 14+10 = 24
(12•13)•4 = 156•4 = 624
12•(13•4) = 12•52 = 624
12•(13+4) = 12•17 = 204
12•13+12•4 = 156+48 = 204
(6•1)•9 = 6•9 = 54
6•(1•9) = 6•9 = 54
6•(1+9) = 6•10 = 60
6•1+6•9 = 6+54 = 60
Concluzii : a•(b•c) = (a•b)•c
a•(b+c) = a•b+a•c
Sper că te-am ajutat! :)
