(970-90+20)/20怎么简便算法?

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(970-90+20)/20怎么简便算法?(970-90+20)/20怎么简便算法?(970-90+20)/20怎么简便算法?(970-90+20)/20=(970-90+30-10)/20=(100

(970-90+20)/20怎么简便算法?
(970-90+20)/20怎么简便算法?

(970-90+20)/20怎么简便算法?
(970-90+20)/20=(970-90+30-10)/20=(1000-100)/20=1000/20-100/20=50-5=45

心算最简便

(900+70-90+20)/20=900/20