Read the pictures below and answer the questions.

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/04/30 10:38:57

提示：
第一题：由于曲线过（0,0）,开口向上,故a>0,且a*0^2-0+a^2-1=0.由此可以确定a=1.
第二题：由题意,角C=角B,角BDA+角BAD＝180-45 角BDA＋角CDE ＝180－角ADE＝180-45
所以角BAD=角CDE,由此得到两三角形相似.

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