5/9× 21/5+18/5÷9/7
=7/3+18/5*7/9
=7/3+14/5
=35/15+42/15
=77/15
5/9× 21/5+18/5÷9/7
=1/9*1/5*(5*21+18*7)
=1/45*(105+126)
=1/45*231
=77/15
5/9× 21/5+18/5÷9/7簡(jiǎn)便計(jì)算
5/9× 21/5+18/5÷9/7簡(jiǎn)便計(jì)算
數(shù)學(xué)人氣：338 ℃時(shí)間：2020-04-04 13:24:36
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