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va rog;
4,12x=20,6
5x=21
3x =4,23
8x =20


Răspuns :

4,12x=20,6
x=20,6/4,12=206/10:412/100=206/10·100/412=2060/412=5
x=5

5x=21
x=21/5
x=4,2

3x=4,23
x=4,23/3
x=423/100:3/1=423/100·1/3=141/100
x=1,41

8x=20
x=20/8=10/4=5/2=2,5
x=2,5