跪求2012同心圆梦模拟六语文英语答案

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1.0 2.y=±二分之根号二x 3.根号五 4.log2 0.7 5.-1 6.89 7.[0,2/3π] 8.2/5 9.7 10.1 11.x +y +4x-4y=0 12.[2k-1/2,