锟斤拷锟斤拷锟斤拷锟轿猴拷锟斤拷(sh锟斤拷)锟侥伙拷锟斤拷锟斤拷示锟斤拷式锟斤拷y=ax2+bx+c(a≠0)锟斤拷小锟斤拷锟斤拷锟斤拷锟剿高匡拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)知锟絉(sh锟斤拷)锟絚(di锟斤拷n)锟斤拷請(q锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷I.锟斤拷锟絰锟絚锟斤拷锟絰锟斤拷锟絖(d锟斤拷)式

锟斤拷锟斤拷一锟斤拷兀锟斤拷锟阶冿拷锟絰锟斤拷锟斤拷變锟斤拷y之锟絞锟斤拷锟斤拷锟斤拷锟斤拷锟絇(gu锟斤拷n)系锟斤拷

锟斤拷锟斤拷y=ax^2+bx+c

锟斤拷锟斤拷(a锟斤拷b锟斤拷c锟介常锟斤拷(sh锟斤拷)锟斤拷a≠0锟斤拷锟斤拷a锟絈锟斤拷锟斤拷锟斤拷(sh锟斤拷)锟斤拷锟絖(k锟斤拷i)锟节凤拷锟斤拷锟斤拷a>0锟絩(sh锟斤拷)锟斤拷锟絖(k锟斤拷i)锟节凤拷锟斤拷锟斤拷锟斤拷锟斤拷a<0锟絩(sh锟斤拷)锟斤拷锟絖(k锟斤拷i)锟节凤拷锟斤拷锟斤拷锟斤拷锟斤拷IaI還锟斤拷锟皆決锟斤拷锟絖(k锟斤拷i)锟节达拷小锟斤拷IaI越锟斤拷锟絖(k锟斤拷i)锟节撅拷越小锟斤拷IaI越小锟絖(k锟斤拷i)锟节撅拷越锟斤拷.)

锟斤拷锟斤拷锟絫锟絈(ch锟斤拷ng)y锟斤拷x锟侥讹拷锟轿猴拷锟斤拷(sh锟斤拷)锟斤拷

锟斤拷锟斤拷锟斤拷锟轿猴拷锟斤拷(sh锟斤拷)锟斤拷锟絖(d锟斤拷)式锟斤拷锟斤拷邊通锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷(xi锟斤拷ng)式锟斤拷

锟斤拷锟斤拷II.锟斤拷锟轿猴拷锟斤拷(sh锟斤拷)锟斤拷锟斤拷锟絅锟斤拷锟絖(d锟斤拷)式

锟斤拷锟斤拷一锟斤拷式锟斤拷y=ax^2+bx+c(a锟斤拷b锟斤拷c锟介常锟斤拷(sh锟斤拷)锟斤拷a≠0)

锟斤拷锟斤拷锟斤拷c(di锟斤拷n)式锟斤拷y=a(x-h)^2+k[锟斤拷锟斤線(xi锟斤拷n)锟斤拷锟斤拷c(di锟斤拷n)P(h锟斤拷k)]

锟斤拷锟斤拷锟斤拷锟絚(di锟斤拷n)式锟斤拷y=a(x-x?)(x-x?)[锟紿锟斤拷锟斤拷锟絚x锟絊锟叫斤拷锟絚(di锟斤拷n)A(x?锟斤拷0)锟斤拷B(x?锟斤拷0)锟侥掞拷锟斤線(xi锟斤拷n)]

锟斤拷锟斤拷注锟斤拷锟斤拷3锟絅锟斤拷式锟侥伙拷锟斤拷锟紻(zhu锟斤拷n)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絇(gu锟斤拷n)系锟斤拷

锟斤拷锟斤拷h=-b/2ak=(4ac-b^2)/4ax?锟斤拷x?=(-b±√b^2-4ac)/2a

锟斤拷锟斤拷III.锟斤拷锟轿猴拷锟斤拷(sh锟斤拷)锟侥圖锟斤拷

锟斤拷锟斤拷锟斤拷平锟斤拷直锟斤拷锟斤拷锟斤拷(bi锟斤拷o)系锟斤拷锟斤拷锟斤拷锟斤拷锟轿猴拷锟斤拷(sh锟斤拷)y=x^2锟侥圖锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟皆匡拷锟斤拷锟斤拷锟斤拷锟轿猴拷锟斤拷(sh锟斤拷)锟侥圖锟斤拷锟斤拷一锟絣锟斤拷锟斤線(xi锟斤拷n)锟斤拷

锟斤拷锟絇(gu锟斤拷n)锟斤拷锟絔锟斤拷

锟斤拷锟斤拷锟竭匡拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)知锟絉(sh锟斤拷)锟絚(di锟斤拷n)锟絉锟斤拷

锟斤拷锟铰高匡拷锟結訊锟斤拷锟竭匡拷锟斤拷锟斤拷锟斤拷锟斤拷前锟斤拷(zh锟斤拷n)锟戒、志愿锟斤拷锟�(b锟斤拷o)锟斤拷锟饺★拷锟�?j锟斤拷n)?sh锟斤拷)锟斤拷(xi锟斤拷n)锟斤拷

锟竭匡拷锟絩(sh锟斤拷)锟絞锟斤拷(xi锟斤拷n)锟斤拷全锟斤拷锟斤拷要锟斤拷(ji锟斤拷)锟絚(di锟斤拷n)

锟組锟斤拷"锟竭匡拷锟絎(w锟斤拷ng)"微锟脚癸拷锟斤拷號(h锟斤拷o)