Answer:
1.56-2(20+12/4x3-2x2)+10
56-2(20+12/12-4)+10
56-2(20+1-4)+10
56-2(21-4)+10
56-2(17)+10
56-34+10
22+10
=32
2.10²-16/8
100-16/8
100-2
=98
3.3+6x(5+4)/3-7
3+6x9/3-7
3+54/3-7
3+18-7
21-7
=14
4.(7+18)x3/(2+13)-28
25x3/15-28
75/15-28
5-28
=-23
5.6+((16-4)/(2²+2))-2
6+(12/(4+2))-2
6+(12/6)-2
6+2-2
8-2
=6
