5+7-6+1+2+2-8*5:1+20-5+5+6+5=2
Giải thích:
=5+7-6+1+2+2-40:1+20-5+5+6+5
=5+7-6+1+2+2-40+20-5+5+6+5
=12-6+1+2+2-40+20-5+5+6+5
=6+1+2+2-40+20-5+5+6+5
=7+2+2-40+20-5+5+6+5
=9+2-40+20-5+5+6+5
=11-40+20-5+5+6+5
=(-29)+20-5+5+6+5
=(-9)-5+5+6+5
=(-14)+5+6+5
=(-9)+6+5
=(-3) +5
=2