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(2+4+6+8+10)-(1+2+3+4+5)=

Răspuns :

=(6+14+10)-(6+9)
=30-15
=15

(2+4+6+8+10)-(1+2+3+4+5)=(6+6+8+10)-(1+2+3+4+5)=(12+8+10)-(1+2+3+4+5)=(20+10)-(1+2+3+4+5)=30-(3+3=4+5)=30-(6+4+5)=30-(10+5)=30-15=15