Question

{[(9x3xa-79)x61-78]x15+340}:250=36:9

Dau coroana!

Answer 1

{[(9x3xa-79)x61-78]x15+340}:250=36:9
{[(27×a-79)×61-78]×15+340}:250 = 4
{[(27×a-79)×61-78]×15+340} = 4×250
[(27×a-79)×61-78]×15+340 = 1 000
[(27×a-79)×61-78]×15 = 1 000-340
[(27×a-79)×61-78]×15 = 660
[(27×a-79)×61-78] = 660:15
(27×a-79)×61-78 = 44
(27×a-79)×61 = 44+78
(27×a-79)×61 = 122
27×a-79 = 122:61
27×a-79 = 2
27×a = 2+79
27×a = 81
a = 81:27
a = 3