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九年级 专题6 课前

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九年级 专题6 课前. 九年级 专题6 课前. 参考答案: 1、 D 2、 A 3、 D 4、 D 5、 D 6、 C 7、 A 8、 A. 九年级 专题6 课前. 九年级 专题6 课前. 九年级 专题6 课前. 九年级 专题6 课前. 九年级 专题6 课前. 九年级 专题6 课前. 九年级 专题6 课前. 九年级 专题6 课前. 九年级 专题6 课后. 九年级 专题6 课后. 解:(1)A(- -1,0),C(- ,-1).

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九年级 专题6 课前

参考答案:

1、D 2、A 3、D 4、D

5、D 6、C 7、A 8、A

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九年级 专题6 课后

解:(1)A(- -1,0),C(- ,-1)

(2)过点C画CH⊥AB于H,则CH=AH=BH=1,∴∠ACB=90°

(3)当CH= AH时,∠ACB=60°

∴将已知抛物线向下平移2个单位,就能使∠ACB=60°

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(2)S四边形ACDE 解得

∴当 时,四边形EACD的面积等于2。

九年级 专题6 课后

(1)易得四边形EACF是平行四边形,当AC=AE时,

□ EACF是菱形,即

∴当 时,四边形EACF是菱形。

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九年级 专题6 课后

解:

(1)把(-1,3)代入y=kx+4,解得k=1.

(2)当∠PAB=90°时,P1点坐标为(-2,2);

当∠PBA=90°时,P2点坐标为(8,12);

当∠BPA=90°时,P3点坐标为(0,4), (-1,3).