Transforme chaque soustraction en addition puis effectue-la.
a. (+ 1) (+ 3)
b. (-20) (+12)
c. (- 7) - (- 7)
d. (+13) - (+ 17)
e. (+22) - (- 11)
f. (+ 8) - (+6)
g. (− 4) − (+ 4)
h. (+43) − (− 17)
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