[Toán 8]Chứng minh

C

cohoctronho15

ban tinh' ra: 1^3+2^3+3^3+4^3+5^3= 1+ 8+27+64+125=225=15^2 (1)
(1+2+3+4+5)^2= 15^2 (2)

Tun (1) va (2) => dpcm :)
 
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