Răspuns :
[tex][(a:5)*2]:4+5=9 =\ \textgreater \ [(a:5)*2]:4=9-5 \\ (a:5)*2=4*4 \\ a:5=16:2 \\ a=8*5 \\ a=40[/tex]
[ (a : 5) x 2 ] :4 + 5 = 9
[ ( a : 5 ) x 2 ] :4 = 9 - 5
[ ( a : 5 ) x 2 ] ;4 = 4
( a : 5 ) x 2 = 4 x 4
a : 5 x2 = 16
a : 5 = 16 : 2
a : 5 = 8
a = 5 x 8
a = 40
[ ( a : 5 ) x 2 ] :4 = 9 - 5
[ ( a : 5 ) x 2 ] ;4 = 4
( a : 5 ) x 2 = 4 x 4
a : 5 x2 = 16
a : 5 = 16 : 2
a : 5 = 8
a = 5 x 8
a = 40