算一算,想一想,填一填. 【数学题】题目见补充↓↓算一算,想一想,填一填.1+2+1=41+2+3+2+1=91+2+3+4+3+2+1=161+2+3+4+5+4+3+2+1=( )1+2+3+4+……+(n-1)+n+(n-1)+……+4+3+2+1=( )快点~~~~3Q~~~~~~又好又快的
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![算一算,想一想,填一填. 【数学题】题目见补充↓↓算一算,想一想,填一填.1+2+1=41+2+3+2+1=91+2+3+4+3+2+1=161+2+3+4+5+4+3+2+1=( )1+2+3+4+……+(n-1)+n+(n-1)+……+4+3+2+1=( )快点~~~~3Q~~~~~~又好又快的](/uploads/image/z/12563412-60-2.jpg?t=%E7%AE%97%E4%B8%80%E7%AE%97%2C%E6%83%B3%E4%B8%80%E6%83%B3%2C%E5%A1%AB%E4%B8%80%E5%A1%AB.+%E3%80%90%E6%95%B0%E5%AD%A6%E9%A2%98%E3%80%91%E9%A2%98%E7%9B%AE%E8%A7%81%E8%A1%A5%E5%85%85%E2%86%93%E2%86%93%E7%AE%97%E4%B8%80%E7%AE%97%2C%E6%83%B3%E4%B8%80%E6%83%B3%2C%E5%A1%AB%E4%B8%80%E5%A1%AB.1%2B2%2B1%3D41%2B2%2B3%2B2%2B1%3D91%2B2%2B3%2B4%2B3%2B2%2B1%3D161%2B2%2B3%2B4%2B5%2B4%2B3%2B2%2B1%3D%EF%BC%88++%EF%BC%891%2B2%2B3%2B4%2B%E2%80%A6%E2%80%A6%2B%EF%BC%88n-1%EF%BC%89%2Bn%2B%EF%BC%88n-1%EF%BC%89%2B%E2%80%A6%E2%80%A6%2B4%2B3%2B2%2B1%3D%EF%BC%88++%EF%BC%89%E5%BF%AB%E7%82%B9%7E%7E%7E%7E3Q%7E%7E%7E%7E%7E%7E%E5%8F%88%E5%A5%BD%E5%8F%88%E5%BF%AB%E7%9A%84)
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