(1+19/105)+(1+19/105*2)+(1+19/105*3)+···+(1+19/105*20)算式也要
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(1+19/105)+(1+19/105*2)+(1+19/105*3)+···+(1+19/105*20)算式也要
(1+19/105)+(1+19/105*2)+(1+19/105*3)+···+(1+19/105*20)
算式也要
(1+19/105)+(1+19/105*2)+(1+19/105*3)+···+(1+19/105*20)算式也要
把各个括号里面的1结合 后面的结合
变成1*20+19/105*(1+...+20)=20+19/105*21*10=20+38=58