20 19-03-06

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( 1) (-9)-(- 13)+(-20)+(-2)

(2) 3+ 13-(-7)/6

(3) (-2)-8- 14- 13

(4) (-7)*(- 1)/7+8

(5) (- 1 1)*4-(- 18)/ 18

(6) 4+(- 1 1)- 1/(-3)

(7) (- 17)-6- 16/(- 18)

(8) 5/7+(- 1)-(-8)

(9) (- 1)*(- 1)+ 15+ 1

( 10) 3-(-5)*3/(- 15)

( 1 1) 6*(- 14)-(- 14)+(- 13)

( 12) (- 15)*(- 13)-(- 17)-(-4)

( 13) (-20)/ 13/(-7)+ 1 1

( 14) 8+(- 1)/7+(-4)

( 15) (- 13)-(-9)* 16*(- 12)

( 16) (- 1)+4* 19+(-2)

( 17) (- 17)*(-9)-20+(-6)

( 18) (-5)/ 12-(- 16)*(- 15)

( 19) (-3)- 13*(-5)* 13

(20) 5+(-7)+ 17- 10

1 - 18

2 103/6

3 -37

4 9

5 -43

6 -(20/3)

7 -( 199/9)

8 54/7

9 17

10 2

1 1 -83

12 2 16

13 102 1/9 1

14 27/7

15 - 174 1

16 73

17 127

18 -(2885/ 12)

19 842

20 5 references