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先化简,再求值:,其中x=+1,y=-1,-九年级数学
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小马虎在下面的计算中只作对了一道题,他做对的题目是[]A.B.C.D.-八年级数学
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已知|ab-2|+(b-1)2=0,试求:。-七年级数学
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先化简,再求值:()÷,其中a=1+,b=1-。-九年级数学
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化简:=()。-九年级数学
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先化简,再求值:,其中.-九年级数学
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先化简,再求值:其中x=。-九年级数学
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先化简,再求值:,其中x满足x2-3x+2=0。-九年级数学
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计算:-八年级数学
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先化简:(-)÷,然后选取一个适当的a值代入求值.-八年级数学
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先化简,再求值:,其中x=。-九年级数学
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先化简,再求值:,其中。-九年级数学
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先化简,再求值:,其中x=-2。-九年级数学
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计算:()-八年级数学
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先化简,再求值:,其中-八年级数学
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化简()-八年级数学
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化简:()。-八年级数学
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请你阅读下列计算过程,再回答所提出的问题解:(A)(B)(C)(D)(1)上述计算过程中,从哪一步开始出现错误:_______________(2)从B到C是否正确,若不正确,错误的原因是______
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化简:-八年级数学
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化简=()-八年级数学
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化简:=();=()。-八年级数学
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