Mixed problems of addition, subtraction, multiplication and division in mathematics problems

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) 1 1.(- 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)