1.–55+7+99-87 2.(-5) ×(-2)2 3.-32×(-3)2
4.-32÷2÷2 5.20-5÷(-15) 6.-6÷(-3×2) 7.17-8÷(-2)+4×(-3)
8.32-50÷(-2)2×(+0.1)-1 9.–13-[1-(1-0.5×43)] 10.(-8÷23)-(-8÷2) 11.(-12) ×5+(-1) ×52 - 12×5+(-1×5)
12.(-2)2-(-52) ×(-1)5-87÷(-3) ×(-1)4
13.–14-(1-0.5) × ×[2-(-3)2] 14.(-1)8- (1 +2 -3 )×(-24)