Sagot :
INTEGERS
==============================
[tex] \tt \large 13) \: ( + 21) - ( - 11) = \green{32}[/tex]
[tex] \tt \large 14) \: ( + 91) - ( - 40) = \green{131}[/tex]
[tex] \tt \large 15) \: (70) - ( 30) = \green{40}[/tex]
[tex] \tt \large 16) \: ( + 765) - ( - 81) = \green{846}[/tex]
[tex] \tt \large 17) \: ( - 111) - ( + 345) = \green{ - 456}[/tex]
[tex] \tt \large 18) \: ( - 74) - ( - 34) = \green{ - 40}[/tex]
==============================
#CarryOnLearning
(ノ^_^)ノ