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化简:=(),=()。-八年级数学
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化简求值:,其中x=。-九年级数学
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已知x+y≠0,x≠z,y≠z,且,则必有[]A.x=0B.y=0C.z=0D.xyz=0-八年级数学
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化简:(1)(2)-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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计算()-九年级数学
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已知:则下列变形错误的是[]A.R=r1+r2B.R=C.R=D.-八年级数学
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He prefers to stay at home rather than _____ out to play. [ ]A. goB. goesC. goingD. gone -高一英语
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Now more and more young people _____their spare time _____to improve themselves at school or college
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He there with us though he was not feeling well. [ ]A. insisted on going B. insisted to go C. insist
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化简:=()。-九年级数学
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