初一数学计算题,求过程和答案

如题所述

1-9/14+8/21+1/7-17/35-27/7
=5/14+8/21-17/35-26/7
=15/42+16/42-156/42-17/35
=125/42-17/35
=625/210-102/210
=523/210.
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