1.–55+7+99-872.(-5)×(-2)23.-32×(-3)2
4.-32÷2÷25.20-5÷(-15)6.-6÷(-3×2)7.17-8÷(-2)+4×(-3)
8.32-50÷(-2)2×(+0.1)-19.–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)