Report - Bµi 9. 1.RÏ NH¸NH: VÝ dô: Gi¶i ph¬ng tr×nh bËc hai ax 2 +bx+c=0 (a 0) H·y nªu c¸c bíc gi¶i ph¬ng tr×nh bËc hai? NNhËp hÖ sè a,b,c TTÝnh Delta=b.

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