Question

( c+3)×3=39 ,(d×10)×4=400​

Answer 1

Răspuns:

(c+3)x3=39

c+3=39:3

c+3=13

c=13-3

c=10

(dx10)x4=400

dx10=400:4

dx10=100

d=100:10

d=10

Answer 2

Răspuns:

c x 3 + 3 x 3 = 39 | -3x3

c x 3 = 30 | ÷3

c = 10

(d x 10) x 4 = 400 | ÷4

d x 10 = 100 | ÷10

d = 10