Question

{[(27*a-79)*61-78]*15+340}:250=4
Prin operația inversa de la 4si250

Answer 1

{ [ (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 = 1000
[ ( 27 × a - 79 ) × 61 - 78 ] × 15 = 1000 - 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

Answer 2

{[(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}=1000
{[(27×a-79)×61-78]×15}=1000-340
{[(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