решите уравнения:14+6.2а+2.4а=69.9

Question

решите уравнения:14+6.2а+2.4а=69.9

Answer 1

14+6.2а+2.4а=69.9

6.2a+2.4a=-14+69.9

8.6a=55.9

a=55.9/8.6

a=6.5

 

14+6.2*6.5+2.4*6.5=69.9

69.9=69.9