Cho |a| < 1, |a - c| < 214, |b - 1| <214. Chứng minh |ab - c| < 428
Cho |a| < 1, |a - c| < 214, |b - 1| <214. Chứng minh |ab - c| < 428
Started By nguyen123456789, 07-03-2016 - 20:13
#2
Posted 08-03-2016 - 07:56
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Đại úy
$|a|<1,|b-1|<214$
$\Rightarrow |ab-a|<214$
Xét $214+214>|ab-a|+|a-c| \ge |ab-a+a-c|=|ab-c|$ (đpcm)
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