-2x^2-5x+1
问题描述:
-2x^2-5x+1
答
2x^2-5x+1=2(x^2-5x/2+1/2)=2[(x^2-5x/2+25/16)-25/16+1/2]=2[(x-5/4)^2-17/16]=2(x-5/4-√17/4)(x-5/4+√17/4)求好评
-2x^2-5x+1
2x^2-5x+1=2(x^2-5x/2+1/2)=2[(x^2-5x/2+25/16)-25/16+1/2]=2[(x-5/4)^2-17/16]=2(x-5/4-√17/4)(x-5/4+√17/4)求好评