巧算:1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72

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• 1-1/2+1/6+1/12+1/20+·········+1/72+1/90巧算
• 1/12+1/20+1/30+1/42+1/56+1/72= 等于多少?
• 1/12+1/20+1/30+1/42+1/56+1/72+1/90．
• 1/2+1/6+1/12+1/20+1/30/1+1/42+1/56+1/72+1/90
• 1/2+1/6+1/20+1/30+1/42+1/56+1/72=怎么算简便?
• 计算：1/2+1/6+1/12+1/20+/+1/30+1/42+1/56+1/72+1/90
• 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72．
• 二、计算. ① 0.625×50+0.625×3.46+5.346×3.75 ② 1+1/2+1/6+1/12+1/20+1/30+1/30+1/42+1/56 ③ （7/9
• 1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算
• 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90用递等式算出来
• 巧算：1/2＋1/6＋1/12＋1/20＋1/30＋1/42＋1/56＝?
• 计算1/2-1/6-1/12-1/20-1/30-1/42等于多少?