Question

aflatil pe a din egalutatile:2×a=82_66+2×1

Answer 1

2×a=82-66+2×1
2×a=16 +2
2×a=18
a=18 : 2
a =9

Answer 2

$2 \times a = 82 - 66 + 2 \times 1 \\ 2 \times a = 16 + 2 \\ 2 \times a = 18 \\ a = 18 \div 2 \\ a = 9$

Proba :
$2 \times 9 = 82 - 66 + 2 \times 1 \\ 18 = 16 + 2 \\ 18 = 18$