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• 已知，求的值-七年级数学
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• 用适当方法解方程组-七年级数学
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• 已知xyz≠0，从方程组中求出x：y：z＝___；-七年级数学
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• -七年级数学
• 解方程组，若要使运算简便，消元的方法应选取[]A．先消去xB．先消去yC．先消去zD．以上说法都不对-七年级数学
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• 解方程组．-九年级数学
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• 解：-七年级数学
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