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先化简,后计算:,其中.-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,,并任选一个你喜欢的数x代入求值。-八年级数学
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甲、乙两人同时从A地出发,沿同一条道路去B地,途中都使用两种不同的速度v1与v2(v1>v2),甲前一半的路程使用速度v1、后一半的路程使用速度v2;乙前一半的时间使用速度v2、后-九年级数学
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=()。-八年级数学
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化简求值:,其中正数a满足a2+a﹣1=0.-九年级数学
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化简:[+÷(+)2]·=()。-八年级数学
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先化简,再求值:,其中,则它的值为()。-八年级数学
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化简求值:当x=﹣2时,式子=()。-八年级数学
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先化简,再求值:-九年级数学
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