Question

a)Daca a+b-=15 si c= 3 calculati ac+bc
b) daca a-b=27si c= 30 calculati ca- cb
c) daca xy+ xz = 126 si x = 5 calculati y-z
d) daca xy-xz=652 si x= 5 calculati y-z
Va rogg frumoss !!! dau coroana plzz am nevoie de exercitiu

Answer 1

a) dai factor comun pe c, prin urmare : c(a+b) ; 3x15= 45

Answer 2

a) a+b=15 c=3 ac+bc
a3+b3
3(a+b)
3×15=45

b) a-b=27 c=30 ca-cb
30a-30b
30(a-b)
30×27=810

c) xy+xz=126 x=5 y-z
5y+5z=126
5(y-z)=126
5×(y-z)=126
y+z= 126:5
y-z= 25.2
esti sigur ca e scrisa bine?

d) xy-xz=652 ×=5 y-z
5y-5z=652
5(y-z) = 652
5×(y-z) =652
652:5=130.4
×-y=130.4
esti sigur ca e scrisa bine?