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

Răspuns :

2×a=82-66+2×1
2
×a=16 +2
2×a=18
a=18 : 2
a =9
[tex]2 \times a = 82 - 66 + 2 \times 1 \\ 2 \times a = 16 + 2 \\ 2 \times a = 18 \\ a = 18 \div 2 \\ a = 9[/tex]

Proba :
[tex]2 \times 9 = 82 - 66 + 2 \times 1 \\ 18 = 16 + 2 \\ 18 = 18[/tex]