下列计算正确的是[]A．B．C．D．-九年级数学

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• 已知，则的值等于[]A.6B.-3C.D.-八年级数学
• 已知两个分式：，，其x≠±2中，则A与B的关系是[]A.相等B.互为倒数C.互为相反数D.A大于B-八年级数学
• 化简：x-+2=（）。-八年级数学
• 化简：-九年级数学
• 计算：=（）。-九年级数学
• The mainland _____fresh water and vegetables _____ people in Hong Kong every day. [ ]A. provides ; f
• After studying in a medical college for five years, Jane ______ her job as a doctor in the countrysi
• The information you give in the application is too general. You should _____ something special about
• Though I ____ his words this time , I don't ____ him. [ ] A. believe in , believe B. believe ,
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• This school was _____ in 1950 and has a history of nearly sixty years.[ ]A. got up B. set up C. sent
• Could you give me a hand? It seems that my strength has ______. [ ]A. used up B. been given out C. r
• Modern forms of transportation and communication have done much to ______ the isolation（隔离）of life i
• Although they lost their jobs, savings and unemployment benefits allow the couple to ______ their co
• Be optimistic, young man! You have to_____ the fact that you have failed in the job interview. [ ]A.
• — Is there a Mr Smith living here? — Yes, there______, but he ______ two days ago. [ ]A. is; moves o
• I often _____the words I don't know in the dictionary or on the internet.[ ]A. look up B. look
• To keep healthy, Professor Johnson _____ cycling as a regular form of exercise after he retired. [ ]
• — How cold the weather is! I wonder how the crops survive under such heavy snow? — Don't worry.
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• 完成句子。1. Honesty and hard work ___________ ___________ (有助于) success and happiness. 2. We'd bett
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• You'd better fly somewhere in the west. Then you can _____ a hire car and travel around. [ ]A.
• China is a country _____ 56 different nationalities, among which Han _____ the majority of its popul
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• 甲、乙两人两次同时在同一粮店购买粮食（假设两次购买粮食的单价不相同），甲每次购买粮食100kg，乙每次购粮用去100元。（1）设第一、第二次购粮单价分别为x元/kg和y元/kg，用含-八年级数学
• 计算：=（）。-九年级数学
• 已知，则（）。-八年级数学
• 化简的结果是[]A.B.C.D.-八年级数学
• 化简的结果是[]A.B.C.1D.-1-八年级数学
• 计算：。-八年级数学
• 下列方程中，是分式方程的个数是（）①x+13=1，②3x+1=4，③x2-1x+1=1，④x2+x-13=2，⑤x+1π+2=x．A．1个B．2个C．3个D．4个-数学
• 方程－=0的解为（）A．x=2B．x=－2C．x=3D．x=－3-九年级数学
• 济宁市“五城同创”活动中，一项绿化工程由甲、乙两工程队承担.已知甲工程队单独完成这项工作需120天，甲工程队单独工作30天后，乙工程队参与合做，两队又共同工作了36天完成-七年级数学
• 解方程：=1﹣．-七年级数学
• 解分式方程：＋＝.-七年级数学