Question

Buna ziua! va rog frumos sa ma ajutati si pe mine la aceste exercitii:a)daca xy+xz=126 si x=5,calculati y+z;b)daca xy-xz=625 si x=5,calculati y-z;c)daca
mn+mp=450 si n+p=10,calculati m;d)daca nm-pm=320 si n-p=16,calculati m.va multumesc!

Answer 1

a)daca xy+xz=126 si x=5,calculati y+z
x(y+z)=126
5*(y+z)=126
y+z=126:5
y+z=25,2

b)daca xy-xz=625 si x=5,calculati y-z
x(y-z)=625
5*(y-z)=625
y-z=625:5
y-z=125

c)daca mn+mp=450 si n+p=10,calculati m
m(n+p)=450
m*10=450
m=450:10
m=45

d)daca nm-pm=320 si n-p=16
m(n-p)=320
m*16=320
m=320:16
m=20