第1个回答 2019-08-23
(1)顶点M(1,0),二次函数可表达为y
=
a(x
-
1)²过A(3,4):a(3
-
1)²
=
4,a
=
1二次函数:y
=
(x
-
1)²
=
x²
-
2x
+
1A(3,4)在直线y
=
x
+
m上:3
+
m
=
4,m
=
1直线:y
=
x
+
1(2)y
=
x
+
1
=
x²
-
2x
+
1x²
-
3x
=
x(x
-
3)
=
0,x
=
0
(x
=
3,点A)B(0,1)B关于x轴的对称点为B'(0,-1)AB'的方程:(y
+
1)/(4
+
1)
=
(x
-
0)/(3
-
0)取y
=
0,x
=
3/5Q(3/5,0)(∆OBQ与∆OB'Q全等,BQ
=
B'Q,B',Q,A在一条直线上)