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同学们请看人民教育出版社《高中数学教科书》A版必修5中第61页的习题2.5A组第4题:求和:(a-1)+(a2-2)+…+(an-n).
Students see People’s Education Press, “High School Mathematics Textbook,” A version of the compulsory 5, page 61 of the exercises 2.5A Group 4: Summation: (a-1) + (a2-2) + ... + (an- n).