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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
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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
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°
(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。
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).
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