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248-246+244-242+...+8-6+4-2=


Răspuns :

248-246+244-242+...+8-6+4-2=  2*(124-123+122-121-......4-3 +2-1)=
2* 62*1=124
= 2+2+2+2+....+2-2 =123 de termeni de la 448-4 =2+2+2+...+2 =2×123 =246