Question

afla nr necunoscut: (n_5× 6+10×5):5+4×8=42

Answer 1

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

înlocuim paranteza cu y

y:5+32=42

y:5=42-32

y:5=10

y=10x5

y=50

n-30+50=50

n-30=50-50

n-30=0

n=30+0

n=30

r:n=30