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    22． 解:延长AC交 ON于点E.········································· 1分 ∵AC⊥ON. ∠OEC=90°.································································ 2分 ∵四边形ABCD是矩形. ∴∠ABC=90°.AD=BC. 又∵∠OCE=∠ACB. ∴∠BAC=∠O=25°. ··················································· 3分 在Rt△ABC中.AC=3. ∴BC=AC·sin25°≈1.27 ················································· 5分 ∴AD≈1.27 ································································ 6分 (注:只要考生用其它方法解出正确的结果.给予相应的分值) 【查看更多】

     

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    （本题满分5分）

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    （本题满分10分）解一元二次方程：
    【小题1】（1）（x+1）2="3               "           【小题2】（2）3y2+4y+1=0

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    （本题满分6分）解二元一次方程组：

     

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    （本题满分6分）解方程：.

     

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    （本题满分10分）解方程组：

    （1）          

                  

    （2）    

     

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