Explicație pas cu pas:
6:[12:a-3(5-10:5)]+2=4
6:[12:a-3(5-2)]+2=4
6:[12:a-3×3]+2=4
6:(12:a-9)+2=4
6:(12:a-9)=4-2
6:(12:a-9)=2
12:a-9=6:2
12:a-9=3
12:a=12
a=12:12
a=1
Răspuns:
6:[12:a-3 x 3]=4-2=2 ; 6: (12:a-9)=2 ; 12:a-9=6:2=3 ; 12:a+0+3=12 ; a=1
