"ᠫᠠᠷᠠᠪᠣᠯ"-ны өөр хувилбарууд
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(Хэрэглэгчид дундын нэг хувилбар харагдахгүй) | |||
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<span style="color:Blue; max-height: 30vh;">ᠡᠨᠡ ᠨᠡᠢᠢᠲᠡᠯᠡᠯ ᠢ ᠮᠡᠷᠭᠡᠵᠢᠯ ᠦᠨ ᠬᠦᠮᠦᠰ <br>(<span style="color:Red;">ᠮᠠᠲ᠋ᠾᠧᠮᠠᠲ᠋ᠢᠭᠴᠢᠳ᠂ ᠪᠠᠭᠰᠢ ᠨᠠᠷ</span>)<br> ᠬᠢᠨᠠᠨ ᠵᠠᠰᠠᠪᠤᠷᠢᠯᠠᠬᠤ ᠱᠠᠭᠠᠷᠳᠠᠯᠭᠠᠲᠠᠢ</span> | <br> | ||
<span style="color:Blue; max-height: 30vh;">ᠡᠨᠡ ᠨᠡᠢᠢᠲᠡᠯᠡᠯ ᠢ ᠮᠡᠷᠭᠡᠵᠢᠯ ᠦᠨ ᠬᠦᠮᠦᠰ <br>(<span style="color:Red;">ᠮᠠᠲ᠋ᠾᠧᠮᠠᠲ᠋ᠢᠭᠴᠢᠳ᠂ ᠪᠠᠭᠰᠢ ᠨᠠᠷ</span>)<br> ᠬᠢᠨᠠᠨ ᠵᠠᠰᠠᠪᠤᠷᠢᠯᠠᠬᠤ ᠱᠠᠭᠠᠷᠳᠠᠯᠭᠠᠲᠠᠢ</span><br><br> | |||
<span style="color:Blue; writing-mode: horizontal-tb;">Энэ<br>нийтлэлийг<br>мэргэжлийн<br>хүмүүс<br>(<span style="color:Red;">математикчид,<br>багш нар</span>)<br>хянан<br>засварлах<br>шаардлагатай</span> | |||
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|[[File:Parabola animada.gif|thumb|center]] | |[[File:Parabola animada.gif|thumb|center]] | ||
|style = "height: 50px;"|ᠲᠥᠪ ᠴᠡᠭ ᠪᠠ ᠲᠤᠬᠠᠢ ᠢᠢᠨ | |style = "height: 50px;"|ᠲᠥᠪ ᠴᠡᠭ ᠪᠠ ᠲᠤᠬᠠᠢ ᠢᠢᠨ ᠰᠢᠯᠤᠭᠤᠨ ᠡᠴᠡ ᠠᠳᠠᠯᠢ ᠵᠠᠢ ᠳ᠋ᠤ ᠪᠠᠢᠢᠷᠢᠯᠠᠬᠤ ᠴᠡᠭ ᠦᠳ ᠦᠨ ᠣᠯᠠᠨᠯᠢᠭ ᠢ ᠫᠠᠷᠠᠪᠣᠯ ᠭᠡᠨ ᠡ᠋ ᠃ | ||
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ᠥᠭᠡᠷ ᠡ᠋ ᠪᠡᠷ ᠬᠡᠯᠡᠪᠡᠯ ᠫᠠᠷᠠᠪᠣᠯ ᠠᠨᠤ ᠲᠥᠪ ᠴᠡᠭ ᠪᠤᠶᠤ ᠹᠣᠻᠦ᠋ᠰ<sup>focus</sup> ᠴᠡᠭ ᠪᠠ | ᠲᠤᠬᠠᠢ ᠢᠢᠨ ᠴᠡᠭ ᠪᠠ ᠲᠤᠬᠠᠢ ᠢᠢᠨ ᠰᠢᠯᠤᠭᠤᠨ ᠡᠴᠡ ᠠᠳᠠᠯᠢ ᠵᠠᠢ ᠳ᠋ᠤ ᠪᠠᠢᠢᠷᠢᠯᠠᠬᠤ ᠴᠡᠭ ᠦᠳ ᠦᠨ ᠣᠯᠠᠨᠯᠢᠭ ᠢ <b>ᠫᠠᠷᠠᠪᠣᠯ</b><sup>parabola</sup> ᠬᠡᠮᠡᠮᠦᠢ᠃ | ||
ᠥᠭᠡᠷ ᠡ᠋ ᠪᠡᠷ ᠬᠡᠯᠡᠪᠡᠯ ᠫᠠᠷᠠᠪᠣᠯ ᠠᠨᠤ ᠲᠥᠪ ᠴᠡᠭ ᠪᠤᠶᠤ ᠹᠣᠻᠦ᠋ᠰ<sup>focus</sup> ᠴᠡᠭ ᠪᠠ ᠳᠢᠷᠧᠻᠲ᠋ᠷᠢᠰ<sup>directrix</sup> ᠰᠢᠯᠤᠭᠤᠨ ᠡᠴᠡ ᠪᠠᠨ ᠠᠳᠠᠯᠢ ᠵᠠᠢ ᠳ᠋ᠤ ᠠᠯᠤᠰᠯᠠᠭᠳᠠᠭᠰᠠᠨ ᠴᠡᠭ ᠦᠨ ᠣᠯᠠᠨᠯᠢᠭ ᠪᠣᠯᠬᠤ ᠬᠠᠪᠲᠠᠭᠠᠢ ᠮᠤᠷᠤᠢ ᠱᠤᠭᠤᠮ ᠶᠤᠮ᠃<ref>[https://www.intmath.com/plane-analytic-geometry/4-parabola.php Interactive Mathematics. The Parabola]. ᠬᠠᠨᠳᠤᠭᠰᠠᠨ 2021/04/10</ref> | |||
ᠲᠡᠭᠦᠨᠴᠢᠯᠡᠨ ᠫᠠᠷᠠᠪᠣᠯ ᠨᠢ ᠳᠤᠭᠤᠢ ᠻᠣᠨᠦ᠋ᠰ ᠤᠨ | ᠲᠡᠭᠦᠨᠴᠢᠯᠡᠨ ᠫᠠᠷᠠᠪᠣᠯ ᠨᠢ ᠳᠤᠭᠤᠢ ᠻᠣᠨᠦ᠋ᠰ ᠤᠨ<sup>конус</sup> ᠭᠠᠳᠠᠷᠭᠤ ᠪᠠ ᠬᠠᠪᠲᠠᠭᠠᠢ ᠢᠢᠨ ᠣᠭᠲᠤᠯᠤᠯᠴᠠᠯ ᠶᠤᠮ᠃<ref name=":0">[https://www.varsitytutors.com/hotmath/hotmath_help/topics/parabolas Varsity Tutors. Hotmath. Parabolas]. ᠬᠠᠨᠳᠤᠭᠰᠠᠨ 2021/04/10</ref> | ||
ᠲᠣᠭᠤᠷᠢᠭ᠂ | ᠲᠣᠭᠤᠷᠢᠭ᠂ ᠧᠯᠯᠢᠫᠰ<sup>ellipse</sup>᠂ [[ᠾᠢᠫᠧᠷᠪᠣᠯ]]<sup>hyperbola</sup>᠂ ᠫᠠᠷᠠᠪᠣᠯ - ᠡᠳᠡᠭᠡᠷ ᠨᠢ ᠻᠣᠨᠦ᠋ᠰ ᠤᠨ ᠣᠭᠲᠤᠯᠤᠯ ᠪᠠᠢᠢᠳᠠᠭ᠃ <ref>[https://www.mathsisfun.com/geometry/conic-sections.html Math is Fun. Conic Sections]. ᠬᠠᠨᠳᠤᠭᠰᠠᠨ 2021/04/10</ref> | ||
ᠫᠠᠷᠠᠪᠣᠯ ᠲᠣᠯᠢᠨ | ᠫᠠᠷᠠᠪᠣᠯ ᠲᠣᠯᠢᠨ ᠲᠡᠭᠰᠢ ᠬᠡᠮᠲᠦ ᠳᠦᠷᠰᠦ ᠲᠡᠢ ᠮᠤᠷᠤᠢ ᠪᠢᠯᠡ᠃ | ||
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==ᠲᠡᠭᠰᠢᠳᠬᠡᠯ== | ==ᠲᠡᠭᠰᠢᠳᠬᠡᠯ== | ||
ᠻᠸᠠᠲᠷᠠᠲ<sup>quadratic</sup> ᠲᠡᠭᠰᠢᠳᠬᠡᠯ ᠦᠨ ᠭᠷᠠᠫᠾᠢᠻ<sup>graphic</sup> ᠨᠢ | ᠻᠸᠠᠲᠷᠠᠲ<sup>quadratic</sup> ᠲᠡᠭᠰᠢᠳᠬᠡᠯ ᠦᠨ ᠭᠷᠠᠫᠾᠢᠻ<sup>graphic</sup> ᠨᠢ ᠨᠤᠮᠤ ᠬᠡᠯᠪᠡᠷᠢ ᠲᠡᠢ ᠫᠠᠷᠠᠪᠣᠯ ᠪᠠᠢᠢᠳᠠᠭ᠃<ref name=":0" /> | ||
ᠻᠸᠠᠲᠷᠠᠲ ᠲᠡᠭᠰᠢᠳᠬᠡᠯ ᠨᠢ ᠳᠠᠷᠠᠭᠠᠬᠢ ᠪᠠᠢᠢᠳᠠᠯ ᠢᠢᠠᠷ ᠪᠢᠴᠢᠭᠳᠡᠳᠡᠭ᠄ | ᠻᠸᠠᠲᠷᠠᠲ ᠲᠡᠭᠰᠢᠳᠬᠡᠯ ᠨᠢ ᠳᠠᠷᠠᠭᠠᠬᠢ ᠪᠠᠢᠢᠳᠠᠯ ᠢᠢᠠᠷ ᠪᠢᠴᠢᠭᠳᠡᠳᠡᠭ᠄ | ||
52-р мөр: | 55-р мөр: | ||
ᠫᠠᠷᠠᠪᠣᠯ ᠤᠨ ᠲᠡᠭᠰᠢᠳᠬᠡᠯ ᠦᠨ ᠰᠣᠩᠭᠤᠳᠠᠭ ᠬᠡᠯᠪᠡᠷᠢ ᠨᠢ ᠳᠠᠷᠠᠭᠠᠬᠢ ᠪᠠᠢᠢᠳᠠᠯ ᠢᠢᠠᠷ ᠪᠢᠴᠢᠭᠳᠡᠳᠡᠭ᠄ | ᠫᠠᠷᠠᠪᠣᠯ ᠤᠨ ᠲᠡᠭᠰᠢᠳᠬᠡᠯ ᠦᠨ ᠰᠣᠩᠭᠤᠳᠠᠭ ᠬᠡᠯᠪᠡᠷᠢ ᠨᠢ ᠳᠠᠷᠠᠭᠠᠬᠢ ᠪᠠᠢᠢᠳᠠᠯ ᠢᠢᠠᠷ ᠪᠢᠴᠢᠭᠳᠡᠳᠡᠭ᠄ | ||
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<math>y^2=2px</math> ᠡᠭᠦᠨ ᠳ᠋ᠦ᠄ <math>p > 0</math> ᠪᠠᠢᠢᠬᠤ ᠠᠭᠠᠳ ᠹᠣᠻᠦ᠋ᠰ ᠪᠠ | <math>y^2=2px</math> ᠡᠭᠦᠨ ᠳ᠋ᠦ᠄ <math>p > 0</math> ᠪᠠᠢᠢᠬᠤ ᠠᠭᠠᠳ ᠹᠣᠻᠦ᠋ᠰ ᠪᠠ ᠳ᠋ᠢᠷᠧᠻᠲ᠋ᠷᠢᠰ ᠦᠨ ᠬᠣᠭᠤᠷᠤᠨᠳᠤᠬᠢ ᠵᠠᠢ ᠲᠠᠢ ᠲᠡᠩᠴᠡᠨ ᠡ᠋᠃ | ||
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{| class="wikitable" | {| class="wikitable" | ||
|[[File:Parts of a Parabola.JPG|thumb|center]] | |[[File:Parts of a Parabola.JPG|thumb|center]] | ||
|style = "height: 100px;"|<math>p</math> ᠨᠢ ᠹᠣᠻᠦ᠋ᠰ ᠪᠠ | |style = "height: 100px;"|<math>p</math> ᠨᠢ ᠹᠣᠻᠦ᠋ᠰ ᠪᠠ ᠳ᠋ᠢᠷᠧᠻᠲ᠋ᠷᠢᠰ ᠦᠨ ᠬᠣᠭᠤᠷᠤᠨᠳᠤᠬᠢ ᠵᠠᠢ ᠲᠠᠢ ᠲᠡᠩᠴᠡᠨ ᠡ᠋ | ||
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== | ==ᠨᠡᠷ ᠡ᠋ ᠲᠣᠮᠢᠶᠠᠯᠠᠯ== | ||
ᠫᠠᠷᠠᠪᠣᠯ - parabola - парабола | |||
ᠴᠡᠭ - point - точка | |||
ᠣᠯᠠᠨᠯᠢᠭ - set - множество | |||
ᠮᠤᠷᠤᠢ - curve - кривая | |||
ᠲᠡᠭᠰᠢᠳᠬᠡᠯ - equation - уравнение | |||
ᠲᠡᠩᠴᠡᠳᠬᠡᠯ ᠪᠢᠰᠢ - inequality - неравенство | |||
ᠲᠣᠮᠢᠶ ᠠ᠋ - formula - формула | |||
ᠹᠦᠨ᠍ᠻᠼᠢ - function - функция | |||
ᠹᠣᠻᠦ᠋ᠰ - focus - фокус | |||
ᠳ᠋ᠢᠷᠧᠻᠲ᠋ᠷᠢᠰ - directrix - директриса | |||
ᠲᠡᠭᠰᠢ ᠬᠡᠮ - symmetry - симметрия | |||
==ᠤᠶᠠᠯᠳᠤᠭ ᠠ᠋ ᠲᠠᠢ ᠨᠡᠢᠢᠲᠡᠯᠡᠯ== | |||
[[ᠾᠢᠫᠧᠷᠪᠣᠯ]]<br><br> | |||
==ᠡᠬᠢ ᠰᠤᠷᠪᠤᠯᠵᠢ== | ==ᠡᠬᠢ ᠰᠤᠷᠪᠤᠯᠵᠢ== | ||
< | <span style="writing-mode: horizontal-tb; "><references/> |
17:52, 10 Дөрөвдүгээр сар 2021-ий байдлаарх одоогийн засвар
ᠡᠨᠡ ᠨᠡᠢᠢᠲᠡᠯᠡᠯ ᠢ ᠮᠡᠷᠭᠡᠵᠢᠯ ᠦᠨ ᠬᠦᠮᠦᠰ
(ᠮᠠᠲ᠋ᠾᠧᠮᠠᠲ᠋ᠢᠭᠴᠢᠳ᠂ ᠪᠠᠭᠰᠢ ᠨᠠᠷ)
ᠬᠢᠨᠠᠨ ᠵᠠᠰᠠᠪᠤᠷᠢᠯᠠᠬᠤ ᠱᠠᠭᠠᠷᠳᠠᠯᠭᠠᠲᠠᠢ
Энэ
нийтлэлийг
мэргэжлийн
хүмүүс
(математикчид,
багш нар)
хянан
засварлах
шаардлагатай
ᠫᠠᠷᠠᠪᠣᠯ[засварлах | кодоор засварлах]
ᠲᠥᠪ ᠴᠡᠭ ᠪᠠ ᠲᠤᠬᠠᠢ ᠢᠢᠨ ᠰᠢᠯᠤᠭᠤᠨ ᠡᠴᠡ ᠠᠳᠠᠯᠢ ᠵᠠᠢ ᠳ᠋ᠤ ᠪᠠᠢᠢᠷᠢᠯᠠᠬᠤ ᠴᠡᠭ ᠦᠳ ᠦᠨ ᠣᠯᠠᠨᠯᠢᠭ ᠢ ᠫᠠᠷᠠᠪᠣᠯ ᠭᠡᠨ ᠡ᠋ ᠃ |
ᠲᠤᠬᠠᠢ ᠢᠢᠨ ᠴᠡᠭ ᠪᠠ ᠲᠤᠬᠠᠢ ᠢᠢᠨ ᠰᠢᠯᠤᠭᠤᠨ ᠡᠴᠡ ᠠᠳᠠᠯᠢ ᠵᠠᠢ ᠳ᠋ᠤ ᠪᠠᠢᠢᠷᠢᠯᠠᠬᠤ ᠴᠡᠭ ᠦᠳ ᠦᠨ ᠣᠯᠠᠨᠯᠢᠭ ᠢ ᠫᠠᠷᠠᠪᠣᠯparabola ᠬᠡᠮᠡᠮᠦᠢ᠃
ᠥᠭᠡᠷ ᠡ᠋ ᠪᠡᠷ ᠬᠡᠯᠡᠪᠡᠯ ᠫᠠᠷᠠᠪᠣᠯ ᠠᠨᠤ ᠲᠥᠪ ᠴᠡᠭ ᠪᠤᠶᠤ ᠹᠣᠻᠦ᠋ᠰfocus ᠴᠡᠭ ᠪᠠ ᠳᠢᠷᠧᠻᠲ᠋ᠷᠢᠰdirectrix ᠰᠢᠯᠤᠭᠤᠨ ᠡᠴᠡ ᠪᠠᠨ ᠠᠳᠠᠯᠢ ᠵᠠᠢ ᠳ᠋ᠤ ᠠᠯᠤᠰᠯᠠᠭᠳᠠᠭᠰᠠᠨ ᠴᠡᠭ ᠦᠨ ᠣᠯᠠᠨᠯᠢᠭ ᠪᠣᠯᠬᠤ ᠬᠠᠪᠲᠠᠭᠠᠢ ᠮᠤᠷᠤᠢ ᠱᠤᠭᠤᠮ ᠶᠤᠮ᠃[1]
ᠲᠡᠭᠦᠨᠴᠢᠯᠡᠨ ᠫᠠᠷᠠᠪᠣᠯ ᠨᠢ ᠳᠤᠭᠤᠢ ᠻᠣᠨᠦ᠋ᠰ ᠤᠨконус ᠭᠠᠳᠠᠷᠭᠤ ᠪᠠ ᠬᠠᠪᠲᠠᠭᠠᠢ ᠢᠢᠨ ᠣᠭᠲᠤᠯᠤᠯᠴᠠᠯ ᠶᠤᠮ᠃[2]
ᠲᠣᠭᠤᠷᠢᠭ᠂ ᠧᠯᠯᠢᠫᠰellipse᠂ ᠾᠢᠫᠧᠷᠪᠣᠯhyperbola᠂ ᠫᠠᠷᠠᠪᠣᠯ - ᠡᠳᠡᠭᠡᠷ ᠨᠢ ᠻᠣᠨᠦ᠋ᠰ ᠤᠨ ᠣᠭᠲᠤᠯᠤᠯ ᠪᠠᠢᠢᠳᠠᠭ᠃ [3]
ᠫᠠᠷᠠᠪᠣᠯ ᠲᠣᠯᠢᠨ ᠲᠡᠭᠰᠢ ᠬᠡᠮᠲᠦ ᠳᠦᠷᠰᠦ ᠲᠡᠢ ᠮᠤᠷᠤᠢ ᠪᠢᠯᠡ᠃
ᠲᠡᠭᠰᠢᠳᠬᠡᠯ[засварлах | кодоор засварлах]
ᠻᠸᠠᠲᠷᠠᠲquadratic ᠲᠡᠭᠰᠢᠳᠬᠡᠯ ᠦᠨ ᠭᠷᠠᠫᠾᠢᠻgraphic ᠨᠢ ᠨᠤᠮᠤ ᠬᠡᠯᠪᠡᠷᠢ ᠲᠡᠢ ᠫᠠᠷᠠᠪᠣᠯ ᠪᠠᠢᠢᠳᠠᠭ᠃[2]
ᠻᠸᠠᠲᠷᠠᠲ ᠲᠡᠭᠰᠢᠳᠬᠡᠯ ᠨᠢ ᠳᠠᠷᠠᠭᠠᠬᠢ ᠪᠠᠢᠢᠳᠠᠯ ᠢᠢᠠᠷ ᠪᠢᠴᠢᠭᠳᠡᠳᠡᠭ᠄
ᠡᠭᠦᠨ ᠳ᠋ᠦ᠄
ᠪᠤᠶᠤ a, b, c ᠨᠢ ᠪᠣᠳᠠᠲᠤ ᠲᠣᠭ ᠠ᠋ ᠪᠠᠢᠢᠨ ᠠ᠋᠃
ᠮᠥᠨ a ᠨᠢ 0 ᠪᠤᠰᠤ ᠤᠳᠬ ᠠ᠋ ᠲᠠᠢ ᠪᠠᠢᠢᠨ ᠠ᠋᠃
b ᠢᠢᠨ ᠤᠳᠬ ᠠ᠋ |
ᠬᠡᠯᠪᠡᠷᠢ ᠢᠢᠨ ᠹᠦᠨ᠍ᠻᠼᠢ ᠢᠢᠨfunction ᠭᠷᠠᠫᠾᠢᠻ ᠴᠤ ᠫᠠᠷᠠᠪᠣᠯ ᠪᠠᠢᠢᠬᠤ ᠠᠭᠠᠳ ᠡᠨᠡ ᠨᠢ ᠪᠥᠭᠡᠳ ᠪᠠᠢᠢᠬᠤ ᠦᠶ ᠡ᠋ ᠢᠢᠨ ᠲᠣᠬᠢᠶᠠᠯᠳᠠ ᠶᠤᠮ᠃
ᠫᠠᠷᠠᠪᠣᠯ ᠤᠨ ᠲᠡᠭᠰᠢᠳᠬᠡᠯ ᠦᠨ ᠰᠣᠩᠭᠤᠳᠠᠭ ᠬᠡᠯᠪᠡᠷᠢ ᠨᠢ ᠳᠠᠷᠠᠭᠠᠬᠢ ᠪᠠᠢᠢᠳᠠᠯ ᠢᠢᠠᠷ ᠪᠢᠴᠢᠭᠳᠡᠳᠡᠭ᠄
ᠡᠭᠦᠨ ᠳ᠋ᠦ᠄ ᠪᠠᠢᠢᠬᠤ ᠠᠭᠠᠳ ᠹᠣᠻᠦ᠋ᠰ ᠪᠠ ᠳ᠋ᠢᠷᠧᠻᠲ᠋ᠷᠢᠰ ᠦᠨ ᠬᠣᠭᠤᠷᠤᠨᠳᠤᠬᠢ ᠵᠠᠢ ᠲᠠᠢ ᠲᠡᠩᠴᠡᠨ ᠡ᠋᠃
ᠨᠢ ᠹᠣᠻᠦ᠋ᠰ ᠪᠠ ᠳ᠋ᠢᠷᠧᠻᠲ᠋ᠷᠢᠰ ᠦᠨ ᠬᠣᠭᠤᠷᠤᠨᠳᠤᠬᠢ ᠵᠠᠢ ᠲᠠᠢ ᠲᠡᠩᠴᠡᠨ ᠡ᠋ |
ᠨᠡᠷ ᠡ᠋ ᠲᠣᠮᠢᠶᠠᠯᠠᠯ[засварлах | кодоор засварлах]
ᠫᠠᠷᠠᠪᠣᠯ - parabola - парабола
ᠴᠡᠭ - point - точка
ᠣᠯᠠᠨᠯᠢᠭ - set - множество
ᠮᠤᠷᠤᠢ - curve - кривая
ᠲᠡᠭᠰᠢᠳᠬᠡᠯ - equation - уравнение
ᠲᠡᠩᠴᠡᠳᠬᠡᠯ ᠪᠢᠰᠢ - inequality - неравенство
ᠲᠣᠮᠢᠶ ᠠ᠋ - formula - формула
ᠹᠦᠨ᠍ᠻᠼᠢ - function - функция
ᠹᠣᠻᠦ᠋ᠰ - focus - фокус
ᠳ᠋ᠢᠷᠧᠻᠲ᠋ᠷᠢᠰ - directrix - директриса
ᠲᠡᠭᠰᠢ ᠬᠡᠮ - symmetry - симметрия
ᠤᠶᠠᠯᠳᠤᠭ ᠠ᠋ ᠲᠠᠢ ᠨᠡᠢᠢᠲᠡᠯᠡᠯ[засварлах | кодоор засварлах]
ᠡᠬᠢ ᠰᠤᠷᠪᠤᠯᠵᠢ[засварлах | кодоор засварлах]
- ↑ Interactive Mathematics. The Parabola. ᠬᠠᠨᠳᠤᠭᠰᠠᠨ 2021/04/10
- ↑ 2.0 2.1 Varsity Tutors. Hotmath. Parabolas. ᠬᠠᠨᠳᠤᠭᠰᠠᠨ 2021/04/10
- ↑ Math is Fun. Conic Sections. ᠬᠠᠨᠳᠤᠭᠰᠠᠨ 2021/04/10