1.计算:(1)211×555+445×789+555×789+211×445 (2)S=1-2+3-4+...+(-1)n+1的乘方·n2.小明到父亲经营的小超市参加社会实践活动.一天小明随父亲从银行换回来58张共计200的零钞,用于顾客付款时找零.
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![1.计算:(1)211×555+445×789+555×789+211×445 (2)S=1-2+3-4+...+(-1)n+1的乘方·n2.小明到父亲经营的小超市参加社会实践活动.一天小明随父亲从银行换回来58张共计200的零钞,用于顾客付款时找零.](/uploads/image/z/225977-41-7.jpg?t=1.%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%89211%C3%97555%2B445%C3%97789%2B555%C3%97789%2B211%C3%97445+%EF%BC%882%EF%BC%89S%3D1-2%2B3-4%2B...%2B%EF%BC%88-1%EF%BC%89n%2B1%E7%9A%84%E4%B9%98%E6%96%B9%C2%B7n2.%E5%B0%8F%E6%98%8E%E5%88%B0%E7%88%B6%E4%BA%B2%E7%BB%8F%E8%90%A5%E7%9A%84%E5%B0%8F%E8%B6%85%E5%B8%82%E5%8F%82%E5%8A%A0%E7%A4%BE%E4%BC%9A%E5%AE%9E%E8%B7%B5%E6%B4%BB%E5%8A%A8.%E4%B8%80%E5%A4%A9%E5%B0%8F%E6%98%8E%E9%9A%8F%E7%88%B6%E4%BA%B2%E4%BB%8E%E9%93%B6%E8%A1%8C%E6%8D%A2%E5%9B%9E%E6%9D%A558%E5%BC%A0%E5%85%B1%E8%AE%A1200%E7%9A%84%E9%9B%B6%E9%92%9E%2C%E7%94%A8%E4%BA%8E%E9%A1%BE%E5%AE%A2%E4%BB%98%E6%AC%BE%E6%97%B6%E6%89%BE%E9%9B%B6.)
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