4和5两道填空题
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4和5两道填空题4和5两道填空题 4和5两道填空题4.2y^2+3=7y2y^2-7y+3=02[y^2-7/2y+(7/4)^2]=2*(7/4)^2-32(y-7/4)^2=25/85.
4和5两道填空题
4和5两道填空题
4和5两道填空题
4.2y^2+3=7y2y^2-7y+3=02[y^2-7/2y+(7/4)^2]=2*(7/4)^2-32(y-7/4)^2=25/8
5.将x=1代入:x^2+mx+n=0m+n=-1m^2+2mn+n^2=(m+n)^2=1