a fost răspuns

Daca a = 14, iar b+ c = 25, aflati valoarea expresiilor:
a). a+b+c
b). a+ 3b + 3c
c). 5a+ 2c+ 2b
d).a x b + a x c+ 5a - 16b- 16c.

Răspuns :

a) a+b+c = 25+14 = 39
b) a+3b+3c = a+3(b+c) = 14+3*25 = 14+75 = 89
c)5a+2c+2b = 70+2(c+b) = 70+50 = 120
d)ab+ac+5a-16b-16c = a(b+c)+70-16(b-c) = 350+70-16(b-c) /*(-1) = -350-70+16*25 =-20