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Afla pe y din egalitatea:[(y+540:6)×7-100]:4:5=30

Răspuns :

Răspuns:

[(y+540:6)×7-100]:4:5=30

[(y+90)×7-100]:4=30×5

[(y+90)×7-100]:4=150

[(y+90)×7-100]=150×4

(y+90)×7-100=600

(y+90)×7=600+100

(y+90)×7=700

(y+90)=700:7

y+90=100

y=100-90

y=10