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________时有意义。-八年级数学
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50a+2a2-38a.-数学
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若,则________;________。-八年级数学
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的相反数是_______,=________;=________。-八年级数学
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计算:=2.-八年级数学
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计算:a1a+4b-(a2-b1b)-数学
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