19/12*2-19/12*7/5简便算3/8*(3/1-21/8*0.5)简便算 7/4+5/3-7/4+5/2简便算

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19/12*2-19/12*7/5简便算3/8*(3/1-21/8*0.5)简便算 7/4+5/3-7/4+5/2简便算
19/12*2-19/12*7/5简便算
3/8*(3/1-21/8*0.5)简便算 7/4+5/3-7/4+5/2简便算

19/12*2-19/12*7/5简便算3/8*(3/1-21/8*0.5)简便算 7/4+5/3-7/4+5/2简便算
19/12*2-19/12*7/5
=19/12*(2-7/5)
=19/12*7/9
=133/108
3/8*(3/1-21/8*0.5)
=3/8*(3/1-21/4)
=3/8*7/1
=21/8
7/4+5/3-7/4+5/2
=(7/4-7/4)+(5/3+5/2)
=0+1
=1