Question

Calculați :
a) ab+ac,stiind ca b+c=50si a =2
b) xy+xz+15, stiind ca x=9 si y+z=11
c) ab-ac , stiind ca a =7 si b -c=100
d)5xy + 5xz +21, stiind ca x =4 si y+z=100​

Answer 1

Răspuns:

A)

a(b+c)=2×50=100

B)

x(y+z)+15=9×11+15=99+15=114

C)

a(b-c)=7×100=700

D)5(x+x+y+z)+21=5+108+21=113+21=134