Question

a) daca a=7, b+c=15, b-c=7, calculati ab+ac si ab-ac
b)daca a=7 si b+c+d=70, calculati ab+ac+ad
c)daca a=3 si b+C+d=30,calculati 3a+2(ab+ac+ad)

Answer 1

Răspuns:

Explicație pas cu pas:

ab+ac = a(b+c)= 7*15=105

ab-ac=a(b-c)=7*7=49