Question

Sendo n= (2×6-5) × 10+10, calcule o dobro de n.

Answer 1

facil

Se n = ( 2 x 6 - 5 ) x 10 + 10
n = (12 - 5) x 10 + 10
n = 7 x 10 + 10
n= 80
logo o dobro de n = 2 x 80
2n = 160

Answer 2

n = (2 . 6 - 5) x 10 + 10
n = (12 - 5) x 10 + 10
n = 7 x 10 + 10
n = 70 + 10
n = 80

2.n = 2.80 = 160

R.: 160