七年级有理数巧算一:1+2又1/6+3又1/12+4又1/20+5又1/30+6又1/42+7又1/56二:(1/2+1/3+ … +1/1997)·(1+1/2+ … +1/1996)-(1+1/2+ … +1/1997(1/2+1/3+ … +1/1996)三:已知|ab-2|和|b-1|互为相反数,试求代数式 1/ab+1/(a+1)·(b
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![七年级有理数巧算一:1+2又1/6+3又1/12+4又1/20+5又1/30+6又1/42+7又1/56二:(1/2+1/3+ … +1/1997)·(1+1/2+ … +1/1996)-(1+1/2+ … +1/1997(1/2+1/3+ … +1/1996)三:已知|ab-2|和|b-1|互为相反数,试求代数式 1/ab+1/(a+1)·(b](/uploads/image/z/3819827-11-7.jpg?t=%E4%B8%83%E5%B9%B4%E7%BA%A7%E6%9C%89%E7%90%86%E6%95%B0%E5%B7%A7%E7%AE%97%E4%B8%80%EF%BC%9A1%2B2%E5%8F%881%2F6%2B3%E5%8F%881%2F12%2B4%E5%8F%881%2F20%2B5%E5%8F%881%2F30%2B6%E5%8F%881%2F42%2B7%E5%8F%881%2F56%E4%BA%8C%EF%BC%9A%281%2F2%2B1%2F3%2B+%E2%80%A6+%2B1%2F1997%29%C2%B7%281%2B1%2F2%2B+%E2%80%A6+%2B1%2F1996%29-%281%2B1%2F2%2B+%E2%80%A6+%2B1%2F1997%281%2F2%2B1%2F3%2B+%E2%80%A6+%2B1%2F1996%29%E4%B8%89%EF%BC%9A%E5%B7%B2%E7%9F%A5%7Cab-2%7C%E5%92%8C%7Cb-1%7C%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E8%AF%95%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F+1%2Fab%2B1%2F%28a%2B1%29%C2%B7%28b)
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