-20*(5/3+0.5-4/1要简便

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-20*(5/3+0.5-4/1要简便-20*(5/3+0.5-4/1要简便-20*(5/3+0.5-4/1要简便-20*(5/3+0.5-4/1)=-20*3/5-20*0.5+20*1/4=-12

-20*(5/3+0.5-4/1要简便
-20*(5/3+0.5-4/1
要简便

-20*(5/3+0.5-4/1要简便
-20*(5/3+0.5-4/1)
=-20*3/5-20*0.5+20*1/4
=-12-10+5
=-22+5
=-17