Question

Daca a=18 si b+c=57 , atunci calculati valoarea expresiilor

A)a+b+c B)a+5*b+5*c C)3*a+2*b+2*c a*b+a*c+7*b+7*c


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Answer 1

a =18              b +c = 57 
a + b +c = 18 + 57 = 75
a + 5 · ( b +c) = 18 + 5 · 57 = 18 + 285=303
3·a  + 2· ( b +c ) = 3·18 + 2·57 = 54 +114 = 168

ab + ac + 7· ( b + c) = a ·( b +c) + 7 ·( b +c) = ( b +c) · ( a +7) = 
 = ( 18 + 7) · 57 = 25 · 57 = 1425