evilsport816 幼苗
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已知 x、y为实数,且|x-8|与 √ 2y+2 互为相反数
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Shanghai has been the world-famous business centre since century .
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Mrs. Smith has a bottle of medicine named 666 POWDER FOR COLD at home. Here is the instuction of it.
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One of the best-loved American writers was William Sydney Porter, or O. Henry.
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解方程组:3x+2y+2z=5 2x+3y+2z=7 2x+2y+3z=9
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