2)Se da 2x+2y+45=49 Se cere 4y+4x+32

Răspuns :

2x+2y+45=49

2(x+y)+45=49

2(x+y)=49-45

2(x+y)=4

x+y=4:2

x+y=2

4y+4x+32=

=4(x+y)+32=

=4×2+32=

=8+32=40