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- 6绘画小组男生占45%,后来又来了16个女生,这是男生占总人数的25%,这是绘画小组有多少人?
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- 9如图,已知x,y是实数,且(x+y-1)的平方与根号2x-y+4 互为相反数,求y的x次方的值
- 10陈景润证明了“1+2”?