1) a-b=16
(a+b)-16=24(=)a+b=24+16(=)a+b=40(=)b+16+b=8(=)2b+16=40(=)2b=24(=)b=12 =>
a=b+(a-b)(=)a=12+16(=)a=28
(=)=echivalent
=> = rezulta
3) a)
a*b=91
a*c=260
Deoarece 91 este nr prim =>
Avem 2 cazuri :
Caz 1 : a=1 b=91 =>
c=260 =>
a*(b+c)=1*(260+91)=351
b)a*b+a*c=128(=)a*(b+c)=128(=)2a*(b+c)=128*2(=)2a*(b+c)=256
*=x
La 2 ma mai gandesc putin