Question

Determina numarul necunoscut:
a:(8+7)=90
20-(13+108:b)=1)​

Answer 1

Răspuns:

Salutare!

a:(8+7)=90

a:15=90

a=90×15

a=1 350

v:1 350:(8+7)=1 350:15=90

20-(13+108:b)=1

(13+108:b)=20-1

(13+108:b)=19

108:b=19-13

108:b=6

b=108:6

b=18

v:20-(13+108:18)=20-(13+6)=20-19=1

Baftă!