Question

Afla numerele a,b, si c, stiind ca a+b=3oo, b+c=500, iar a+c=400

Answer 1

2a+2b+2c=300+500+400=1200       2*(a+b+c)=1200            a+b+c=1200:2=600               300+c=600; c=600-300=300                        b+c=500;b+300=500; b=500-300=200              a+b=300;  a+200=300; a=300-200=100

Answer 2

a+b= 300
b+c= 500
a+c= 400

le adunam pe toate parte cu parte si dam factor comun 2
2(a+b+c)= 1200
a+b+c= 600

dar a+b= 300
=> c= 600-300
c=300

b+c= 500
a=600-500
a= 100

a+c= 400
b= 600-400
b= 200

O zi buna!