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Daca a=18sib+c=57 atunci calculati valoarea expresiilor
a) a+b+c
b)a+5×b+5×c
c)3×a+2×b+2×c
d)a×b+c+7×b+7×c


Răspuns :

a) a+b+c = 18 + 57 = 75
b) a + 5xb + 5xc = a + 5(b+c) = 18 + 5 x 57 = 18 + 285 = 303
c) 3xa + 2xb + 2xc = 3 x 18 + 2 x (b+c) = 54 + 2 x 57 = 54 + 114 = 168

Nu ma prind la punctul d) deocamdata!
a)a+b+c=18+57=75
b)a+5×b+5×c=a+5×(b+c)=18+5×57=18+285=303
c)3×a+2×b+2×c=3×a+2×(b+c)=3×18+2×57
=54+114=168
d)a×b+c+7×b+7×c=a×b+c+7×(b+c)
=18×57+7×57=1026+399=1425