| 4*(2+1)= | 8+4=12 |
| 5(3(4-1))= | 5(12-3)=60-15=45 |
| 7(3-2-1)= | 21-14-7=0 |
| 5-3(2-3)= | 5-6+9=8 |
| 49-(-20(2-2))= | 49-(-40+40)=49+40-40=49 |
| 78-(52-49)-(-30)= | 78-52+49+30=105 |
| (200-13)(1+4)= | 200+800-13-52=935 |
| 95-(10-(15+25))= | 95-(10-15-25)=95-10+15+25=125 |
| 100+(15(40-15))= | 100+(600-225)=100+600-225=475 |
| (-9+3)(7+8)= | -63-72+21+24=-90 |
| 100-(90-(80))= | 100-(90-80)=100-90+80=90 |
| -8(-10+5(6-4))= | -8(-10+30-20)=80-240+160=0 |
| 15-(14-(13-(12)))= | 15-(14-(13-12))=15-(14-13+12)=15-14+13-12=2 |
| -(25-15)(-5)= | -(-125+75)=125-75=50 |
| 10(20-30(40-50))= | 10(20-1200+1500)=200-12000+15000=3200 |