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Rezolvati urmatoarele preblemele:

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.

Dau coroana! ;)






























Răspuns :

a) y+z=126:5=25,2
b) 625:5=125
c) m=450:10=45
d) m=320:16=20
a) e gresit b) xy-xz=625 5y-5z=625 5×(y-z)=625 Y-z= 625÷5=125 c) mn+mp=450 n+p=10 m×(n+p)=450 10m=450 m=450÷10 m=45 d) nm-pm=320 N-p=16 m×(n-p)=320 16m=320 m=320÷16 m=20