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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】

題目列表(包括答案和解析)

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（　　）

A、m≤-1

B、m＜-1

C、m≥1

D、m＞1

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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、

B、

C、-

D、-

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不等式組

x-2＞0

x-1＜0

的解集是

．

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