-10+-20+40=???
(-10)+(-20)+40=(-30) + 40= 10
wynik to 10.
-10+(-20)+40=
-10-20+40=
-30+40=
10
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(-10)+(-20)+40=(-30) + 40= 10
wynik to 10.
-10+(-20)+40=
-10-20+40=
-30+40=
10