(2.8*25+12)/(28*2.5)的简便算法要简便算法!简便算法啊!

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(2.8*25+12)/(28*2.5)的简便算法要简便算法!简便算法啊!

(2.8*25+12)/(28*2.5)的简便算法要简便算法!简便算法啊!
(2.8*25+12)/(28*2.5)的简便算法
要简便算法!
简便算法啊!

(2.8*25+12)/(28*2.5)的简便算法要简便算法!简便算法啊!
(2.8*25+12)/(28*2.5)
=(2.8*25/(28*2.5)+12/(28*2.5)
=1+6/35
=1又6/35

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(2.8*25+12)/(28*2.5)
=(28*2.5+12)/(7*4*2.5)
=(7*4*2.5+12)/7
=(7+12)/7
=19/7