Question

15×a+5=50 (38-a):2=17 (56+a):3=20 (90:c):3=10
Dau coroana ! ​

Answer 1

Răspuns:

15*a+5=50|-5

15*a=50-5

15*a=45|:15

a=45:15

a=3

(38-a):2=17|*2

38-a=17*2

38-a=34|+38

a=34+38

a=72

(56+a):3=20|*3

56+a=20*3

56+a=60|-56

a=60-56

a=4

(90:c):3=30|*3

90:c=30*3

90:c=90|*90

c=90*90

c=8100(nu stiu daca acesta este bine)