化简的结果是[]A.B.C.D.-八年级数学

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• 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
• 若分式方程：无解,则k=_________．-九年级数学
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