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数列的求和是高中数学的重要知识点,也是高考比较常见的考点。但在实际教学中,由于教材版本不同等问题,教学的重点有所不同。其实,在等差数列和等比数列的教学中,就有涉及到
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周杰伦内幕追缉令A. 卫生纸突然成配角擦完鼻涕变魔术周杰伦推出全新专辑《八度空间》记者会上,最重要的配角竟然是卫生纸!由于他身体不适,所以频频要拿它擦鼻涕,还幽了自己