199/200x199用简便方法如何计算?

日期:2022-04-12 02:18:18 人气:1

199/200x199用简便方法如何计算?

199/200x199
=(1-1/200)x199
=1x199-1/200x199
=199-199/200
=198又1/200
    A+
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