x^2-4x-1=0
x^2-4x+4=5
(x-2)^2=5
x-2=±√5
x=2±√5
x^2+1=4x+2=4*(2±√5)+2=10±4√5x^2-4x+4=5(x-2)^2 ???????????????????????????x^2-4x+4=5????????￡????????????????x^2+1=4x+2 ?????????? x²??1??4x????????????2????? x²??1??4x????????????2?е?????лл????????????????Щ?? ??????л???????????1??x²=x²??1+2?????????? x²??1??4x??x²??1+2=1??x²??4x+2
x²－1＝4x 1＋x²＝?
x²－1＝4x 1＋x²＝?
數(shù)學人氣：491 ℃時間：2020-05-23 00:30:06
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