200×19.9-199×19.8
=200*19.9-19.9*198
=19.9(200-198)
=19.9*2
=39.8
(3/8+1/15)*8+7/15
=(3/8)*8+(1/15)*8+7/15
=3+(8/15+7/15)
=3+1
=4
你不笨,我也这样
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