1. (2)(3)(-5)(-2)(3)(-7)(8)=6-10-21-8=-1
2. (5)(-5)(3)+2+4-7-12+45-33+75=75+98=173
3. -134-12+13+54-65+67(2)(-3)(4)=-9+24=33
4. 12-44+36-76+89-55+243-74=131
5. (2)(3)(-4)(5)(-6)(7)(-8)(9)(0)=0
6. (12/5)(6/3) +(4/9)(8/11)=1.2+0.50=1.20
7. 14/3 + 15/2 - 6/4 =4.6+7.5-1.5=10.6
8. (((12/5)(15/4)/(13/7)(16/9))(-5)) + 1/2 =2.2+4.8+2+2.3-5=39.25
9. (13/22)/(43/15) - 16/7 =2.3+2.5-2.5=1.5
10. ((9/8)(8/6)/(25/4)) + ((13/45)(45/2)) - 16/4 =231+3546=25
11. (33/17)(45/12) + 3/5 - 18/7 + 16/9 - 25/5 =2.5+3.9+548=28.3