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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
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化简:x-+2=()。-八年级数学
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化简:-九年级数学
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计算:=()。-九年级数学
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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
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计算:=()。-九年级数学
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已知,则()。-八年级数学
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化简的结果是[]A.B.C.D.-八年级数学
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化简的结果是[]A.B.C.1D.-1-八年级数学
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计算:。-八年级数学
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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
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方程-=0的解为()A.x=2B.x=-2C.x=3D.x=-3-九年级数学
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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
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若,则的值为()。-九年级数学
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