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Calculați :

1) (-15)-(-7)+(-18)-(-20)
2) |-2|-5|-|20-39|
3) -(-105)+(+105)-210
4) |-7|-|-10|+3​


Răspuns :

Răspuns:

1. -15+7-18+20 = -6

2. ???

3. 105+105-210 =0

4. 7-10+3=0