摘要：19．计算:． [关键词]分式的化简 [答案]解:原式= = = = 11先化简.再求值:.其中． [关键词]分式的运算 [答案] 原式= = = 当时.原式=． 12 先化简.再求值:.其中 [关键词]分式运算.实数运算 [答案] 13下表为抄录北京奥运会官方票务网公布的三种球类比赛的部分门票价格.某公司购买的门票种类.数量绘制的统计图表如下: 依据上列图表.回答下列问题: (1) 其中观看足球比赛的门票有 张,观看乒乓球比赛的门票占全部门票的 %, (2) 公司决定采用随机抽取的方式把门票分配给100名员工.在看不到门票的条件下.每人抽取一张(假设所有的门票形状.大小.质地完全相同且充分洗匀).问员工小华抽到男篮门票的概率是 , (3) 若购买乒乓球门票的总款数占全部门票总款数的.求每张乒乓球门票的价格. [关键词]频率估计概率.直方图.分式方程 [答案](1)50.20 (2) (3)依题意.有= ． 解得x ≈530 ． 经检验.x =530是原方程的解． 答:每张乒乓球门票的价格约为530元． 14 化简: [关键词]分式运算 [答案] 解:原式=···················································· 2分 =···························································································································································· 4分 =1． 5分 15计算: [关键词]分式运算 [答案] 解:原式=····································································· 2分 =················································································ 3分 ··············································································· 4分 ········································································································· 5分 162009湖北省荆门市)已知x=2+.y=2.计算代数式的值． [关键词]分式运算 [答案] 解:＝ ＝＝························································································· 4分 当x＝2+.y＝2-时.＝-4··································· 6分 17先化简.再求值:.其中． [关键词]分式运算 [答案]解:原式= =． 将代入得:原式=． 18． [关键词]分式运算 [答案]原式． 19 化简:·． [关键词]分式运算 [答案]原式=·=． 20先化简:.当时.请你为任选一个适当的数代入求值． [关键词]分式运算.最简分式 [答案]原式= = = 2120．先化简.再求值:. 其中． [关键词]分式化简 [答案]20．解:原式································ 2分 ······························································································ 3分 ··········································································································· 4分 ·················································································································· 5分 把 ··························································· 6分 22求代数式的值:.其中． [关键词]分式的化简与求值 [答案]解:原式= = = = 当时 上式 23先化简.再求值: +÷.其中x=． [关键词]分式.化简求值 [答案]解:原式= = = = = 当x=时.原式= =1- 24先化简.再求值: .其中 [关键词]分式 [答案]解: =························································································· 3分 ······················································································································· 4分 当时.原式···················································································· 5分 ······························································································· 6分 25先化简.然后从中选取一个你认为合适的数作为x的值代入求值． [关键词]分式的化简求值 [答案]

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