Question

Dacă a=5 si b+c=6 să se afle d) a+2b+2c e) ab+ac f)3a+5•(2a-3) g)26-3•(a+1)+4b+4c-2a

Answer 1

Răspuns:

d a+2b+2c= e ab+ac f 3a+5(2a-3)

=a+2(b+c) =a(b+c) 3a+10a-15

=5+2×6 =5×6 13a-15

=5+12 =30 13×5-15

=17 65-15=50

g 26-3(a+1)+4b+4c-2a

= 26-3(5+1)+4(b+c)-2×5

=26-15-3+4×6-10

=8+24-10

=22