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解:(1)．····················································································· 3分 (2)相等.比值為．················· 5分(無“相等 不扣分有“相等 .比值錯給1分) (3)設(shè). 在矩形中.. . . . . ．···································································································· 6分 同理． . . ．······························································································· 7分 . .······························································································ 8分 解得． 即．······································································································ 9分 (4).·············································································································· 10分 ． 12分 【查看更多】

 

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精英家教網(wǎng)如圖：已知∠B=∠C，AD=AE，則AB=AC，請說明理由（填空）
解：∵在△AEB與△ADC中，
--(已知)
-------(         )
--------(已知)

∴
 

∴AB=AC
 
．

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14、如果不等式（m+1）x＞m+1的解集是x＜1，那么m必須滿足（　　）

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已知
x=1
y=2
是二元一次方程3x-ky=2的一個解，則k=
 
．

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已知
x=3
y=2
是方程x+5ky=5k的一個解，則k的值是（　　）
A、
3
5
B、
5
3
C、-
3
5
D、-
5
3

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不等式組
x-2＞0
x-1＜0
的解集是
 
．

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