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2)Se da 2x+2y+38=62 Se cere 4y+27+4x

Răspuns :

2x+2y+38=62

2(x+y)+38=62

2(x+y)=62-38

2(x+y)=24

x+y=24:2

x+y=12

4y+27+4x=

=4(x+y)+27=

=4×12+27=

=48+27=75