Toán Lớp 8: Chung Minh
(10a-5) ²=100a*(a-1)+25
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Toán Lớp 8: Chung Minh
(10a-5) ²=100a*(a-1)+25
Comments ( 2 )
$=(10a)^2-2.10a.5+25$ $(Hđt$ số $2)$
$=100a^2-100a+25$
$=100a(a-1)+25(đpcm)$