=(1-1/8)×4/21
=7/8×4/21
=1/61/4和1/8同分是5/8,1-5/8=3/8吧？？ 看清楚1/8从哪来的1/4-1/87/8和4/21可以约分吧?你要问几次啊？ 算我白做那你说明白我就不问啦呀
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