2 câu trả lời
`25^2+50.75+75^2`
`= 625 + 50.75 + 75.75`
`=625 + 75 . (50 + 75)`
`= 125.5 + 75.125`
`=125.(5+75)`
`=125.80`
`=10000`
$25^{2}$ + 5 . 75 + $75^{2}$
= $25^{2}$ +5.3.25 + $(25.3)^{2}$
=$25^{2}$ + 5.3.25 +$3^{2}$. $25^{2}$
=25(25+3.5+$3^{2}$ +25)
=25.74
=1850
$#tvan$