Toán 8 - Hàng đẳng thức - Bài toán dễ

H

huuthuyenrop2

$3599= 3600-1= 60^2-1= (60+1)(60-1)=61.59$
$2499 = 2500-1= 50^2-1 = (50-1)(50+1)= 49.51$
$8099 = 8100-1 = 90^2-1 = (90+1)(90-1)= 91.89$
$323= 324-1= 18^2-1= (18+1)(18-1)= 19.17$
 
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