6復 戙悢曽掱幃 1 (1曄悢偺曽掱幃)

戙悢曽掱幃偺夝傪媮傔傞偵偼丄solve 僐儅儞僪傪梡偄傑偡丅


亜solve (a*x^2+b*x+c=0,x)
(ax2+bx+c=0偺夝傪媮傔傞)


2師曽掱幃偺夝偺岞幃偑昞帵偝傟傑偡丅4師傑偱側傜偽昁偢尩枾夝傪摼傞偙偲偑偱偒傑偡丅
5師埲忋偺応崌偼丄堦斒偵戙悢揑偵偼夝偗側偄偙偲偑抦傜傟偰偄傑偡丅




亜solve(x^2-6*x-3=0,x)
(x2-6x-3=0偺夝傪媮傔傞)
3+2併3,  3-2併3




亜evalf(%)
(捈慜偺寢壥偺嬤帡抣傪媮傔傞)
6.464101616, -.464101616




亜solve(x^5-x=-1,x)
(x5-x=-1偺夝傪媮傔傞)
RootOf(_z5-_z+1,index=1) RootOf(_z5-_z+1,index=2)

RootOf(_z5-_z+1,index=3) , RootOf(_z5-_z+1,index=4) ,

RootOf(_z5-_z+1,index=5) 



亜evalf(%)
(捈慜偺寢壥偺嬤帡抣傪媮傔傞)

0.7648844336+0.3524715460*I, -0.1812324445+1.083954101*I, -1.167303978, -.1812324445-1.083954101*I, 0.7648844336-0.3524715460*I



"RootOf(懡崁幃)"偼"懡崁幃=0偺夝"傪巜偟偰偄傑偡丅僀儞僨僢僋僗晅偗偝傟偨宍偱夝偑弌椡偝傟偰偄傑偡丅

幚廗 6.1   師偺曽掱幃偺夝傪媮傔偰傒傑偟傚偆丅傑偨丄夝偺嬤帡抣傪媮傔偰傒傑偟傚偆丅

丂丂丂(1)丂x2-x-1=0 丂丂丂(2)丂x4-x2+1=0 丂丂丂(3)丂x4-x+1=0

[惓夝椺]


幚廗 6.2丂 3師曽掱幃偺夝偺岞幃 ( Cardano偺岞幃)傪媮傔偰傒傑偟傚偆丅

[惓夝椺]