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Daca x=5 si a+b=13 calculati:3*x+7a+7b

Răspuns :

3 × x + 7a + 7b =

3 × x + 7 × (a + b) =

3 × 5 + 7 × 13 =

15 + 91 =

106

x= 5
a+b= 13

3x+ 7a+7b=
3x+ 7(a+b)=
3•5+ 7•13=
15+ 91= 106