Răspuns :
a.) 945•28+945•72= 945(28+72)= 945•100= 94500
b.) a= 4, b+c= 25
ab+ac= a(b+c)= 4•25= 100
b.) a= 4, b+c= 25
ab+ac= a(b+c)= 4•25= 100
a)
945×28+945×72=945×(28+72)
=945×100
=94500
b)
ab+ac= a(b+c)= 4•25= 100