9/20÷(1/3-1/5)×9/14
=9/20÷(5/15-3/15)×9/14
=9/20×15/2×9/14
=(9×15×9)/(20×2×14) (这一步可约分,上下各除以5）
=(9×3×9)/(4×2×14)
=243/112
9/20÷（1/3--1/5）×9/14 能简算就要简算
9/20÷（1/3--1/5）×9/14 能简算就要简算
数学人气：762 ℃时间：2020-02-25 21:21:51
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