Question

Dacă a+b=3,08 b+c=0,55 3a+7b+4c va rog pana maine

Answer 1

3a+7b+4c=3a +3b+ 4b+ 4c
3x(a+b)+ 4x(b+c)=3x3,08+ 4x0,55
9,24+2,2=11,44

Answer 2

Răspuns:

Explicație pas cu pas:

a + b = 3,08   si  b + c = 0,55

3 a + 7 b + 4 c = 11,44

= 3 a + ( 3 a + 4 b ) + 4 c =

= 3 × ( a + b ) + 4 × ( b + c ) =

= 3 × 3,08 + 4 × 0,55 =

= 9,24 + 2,20 =

= 11,44