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afla nr care lipsesc : a) 20+58+ + = 38+10+. +. b) 78-30- - = 88-40- -

Răspuns :

a. 20+58+38+10=38+10+20+58
b. 78-30-10-20=88-40-20-10
1. 20+58+38+10=38+10+20+58
2. 78-30-10-20=88-40-20-10    

succes