Question

3. Află numărul necunoscut: C. (3 x 9+c)-5x3=9x5-5x6 d. 22-{8+[17-(8x5:a-3):2]:4}=10​

Answer 1

Răspuns:

(3 x 9+c)-5x3=9x5-5x6

(27+c)-15=45-30

27+c=15+15

c=30-27

c=3

22-{8+[17-(8x5:a-3):2]:4}=10​

8+[17-(8x5:a-3):2]:4=22-10

[17-(8x5:a-3):2]:4=12-8

17-(8x5:a-3):2=4×4

(8x5:a-3):2=17-16

8x5:a-3=1×2

40:a=2+3

a=40:5

a=8