锟斤拷锟斤拷锟斤拷锟絖(d锟斤拷)式:(a+b)(a-b)=a^2-b^2,锟缴傦拷(g锟斤拷)锟斤拷(sh锟斤拷)锟侥猴拷锟絚锟紷锟缴傦拷(g锟斤拷)锟斤拷(sh锟斤拷)锟斤拷姆e,锟斤拷锟斤拷锟紷锟缴傦拷(g锟斤拷)锟斤拷(sh锟斤拷)锟斤拷平锟斤拷锟斤拷,锟紷锟斤拷(g锟斤拷)锟斤拷式锟酵斤拷锟斤拷锟剿凤拷锟斤拷平锟斤拷锟筋公式

锟斤拷锟斤拷锟斤拷式锟絓(y锟斤拷n)锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷某些锟斤拷母锟斤拷锟叫革拷號(h锟斤拷o)锟侥凤拷式:

锟斤拷锟斤拷1/(3-4锟斤拷锟斤拷號(h锟斤拷o)2)锟斤拷锟斤拷(ji锟斤拷n):

锟斤拷锟斤拷1×(3+4锟斤拷锟斤拷號(h锟斤拷o)2)/(3-4锟斤拷锟斤拷號(h锟斤拷o)2)^2;=(3+4锟斤拷锟斤拷號(h锟斤拷o)2)/(9-32)=(3+4锟斤拷锟斤拷號(h锟斤拷o)2)/-23

锟斤拷锟斤拷[锟解方锟斤拷]

锟斤拷锟斤拷x^2-y^2=1991

锟斤拷锟斤拷[思路锟斤拷锟斤拷]

锟斤拷锟斤拷锟斤拷锟斤拷平锟斤拷锟筋公式锟斤拷锟�

锟斤拷锟斤拷[锟斤拷锟絵锟絕(gu锟斤拷)锟斤拷]

锟斤拷锟斤拷x^2-y^2=1991

锟斤拷锟斤拷(x+y)(x-y)=1991

锟斤拷锟斤拷锟斤拷?y锟斤拷n)?991锟斤拷锟皆分筹拷1×1991,11×181

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絰+y=1991,x-y=1,锟斤拷锟絰=996,y=995

锟斤拷锟斤拷锟斤拷锟絰+y=181,x-y=11,x=96,y=85同锟絩(sh锟斤拷)也锟斤拷锟斤拷锟斤拷負(f锟斤拷)锟斤拷(sh锟斤拷)

锟斤拷锟斤拷锟斤拷锟皆斤拷锟斤拷x=996,y=995,锟斤拷x=996,y=-995,锟斤拷x=-996,y=995锟斤拷x=-996,y=-995

锟斤拷锟斤拷锟斤拷x=96,y=85,锟斤拷x=96,y=-85锟斤拷x=-96,y=85锟斤拷x=-96,y=-85

锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷锟絔锟斤拷

       锟竭讹拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)锟斤拷(f锟斤拷)锟斤拷(x锟斤拷)锟斤拷锟斤拷锟絉锟斤拷

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)锟斤拷锟斤拷志愿锟斤拷锟�(b锟斤拷o)锟斤拷锟饺★拷锟�?j锟斤拷n)?sh锟斤拷)锟斤拷锟斤拷

锟竭匡拷锟絩(sh锟斤拷)锟絞锟斤拷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)