Question

dacă a+b=3,1 b+c=4,5 Atunci calculați (a+b)×(2a+3b+c)​

Answer 1

Explicație pas cu pas:

3,1×(3,1×2+4,5)=

3,1×(6,2+4,5)

3,1×(10,7)

33,17

Answer 2

Răspuns:

a+b=3,1

b+c=4,5=> c=4,5-b

(a+b)*(2a+3b+c)=3,1*(2a+3b+4,5-b)=3,1*(2a+2b+4,5)=

=3,1*(2(a+b)+4,5)

=3,1*(2*3,1+4,5)

=3,1*(6,2+4,5)

=3,1*10,7

=33,17