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5^20+5^18-26×5^18 cum se face?

Răspuns :

5^20+5^18-26×5^18=
5^18(5^2+1)-26×5^18=
5^18×26-26×5^18=0
sau (5^18×26)-(26×5^18)=0 sau (5^18×26 )×(1-1)= (5^18×26)×0=0