Explicație pas cu pas:
4x[(ax3:2-3x3):9+(4x2-2)]
+2x20}:20=20
4x[(ax3:2-9):9+(8-2)]+40}:20=20
4x[(ax3:2-9):9+6]+40}=20 x20
4x[(ax3:2-9):9+6]+40}=400
[(ax3:2-9):9+6]+40}=400:4
[(ax3:2-9):9+6]+40}=100
[(ax3:2-9):9+6]=100 - 40
[(ax3:2-9):9+6]= 60
(ax3:2-9):9= 60-6
(ax3:2-9):9= 54
ax3:2-9= 54×9
ax3:2-9= 486
ax3:2= 486+9
a×3:2= 495
ax3= 495x2
ax3= 990
a= 990:3
a= 330
verificare:
4x[(330x3:2-3x3):9+(4x2-2)]+2x20}:20=20
4x[(990:2-9):9+(8-2)]+2x20}:20=20
4x[(495-9):9+6)]+40}:20=20
4x[486:9+6)]+40}:20=20
4x[54+6)]+40}:20=20
4x (60+40):20=20
4×100:20=20
4×5=20
20=20
