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daca a=4  ,b=2a si c=a+2b afla 2a+2b -c


Răspuns :

c=4+2x2
c=8

2x4+2x2-8=
8+4-8=
12-8=4

a=4 
b=2a = 2·4=8
c=a+2b=4+2·4= 12
2a+2b-c=2·4+2·8-12=8+16-12=12