Question

rezolvati

2 x 4 +2 x 15 x 2 - (x - 15 x 4 ) = 4 x 7

( 3 x a ) + 25 = 2 x 2

20 x 3 + b x 5 = 9 x 10

Answer 1

Răspuns:

8+60-x-60=28

68-x-60=28

-x=28-68+60

x=-20

3a+25=4

3a=-21

a=-7

60+5b=90

5b=30

b=6