Question

Resolva as equações

a. 2x5+ 1 = 5x2- 13





b. 2x - 18- x-22= 5




c. 0,4y + y-12= 0,5y - y+35

Answer 1

Resposta:

a. 2x5+ 1 = 5x2- 13

$10x+1=10x-13\\1=-13$

x ∈ Ф

b. 2x - 18- x-22= 5

$x-18-22=5\\x-40=5\\x=40+5\\x=45$

c. 0,4y + y-12= 0,5y - y+35

$1,4y-12=0,5y-y+35\\1,4y+0,5y-12=35\\1,9y=35+12\\1,9y=47\\y=\frac{470}{19} \\ ou \\ y=24\frac{14}{19} \\ou\\y=24,736842...$