1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88====39*148/149+148*149/86+48*14/149====(1-1/2*2)*(1-1/3*3)*```````*(1-1/10*10)====1/1+2 + 1/1+2+3 + 1/1+2+3+4 + ```````1/1+2+3+````+50====要清楚 这有点难度 所以 欧也!

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