👤

d) (d - 5x6 + 10 x 5): 5+ 4 x 8 = 42​

Răspuns :

(d-5•6+10•5):5+4•8=42
(d-30+50):5+32=42
(d+20):5+32=42
D/5+20/5+32=42
D+20+160=210
D+180=210
D=210-180
D=30


Coroana?

(d-30+50):5+32=42

(d-20):5+32=42

d+20/5+32=42 (/=pe; /=supra)

(inmultesti ambele parti ale ecuatiei cu 5)

d+20+160=210

d+180=210

d=210-180

d=30