=333*3*1/5
=999*1/5
=(1000-1)*1/5
=1000*1/5-1*1/5
=200-1/5
=199+1-1/5
=199+4/5
=199又5分之4
（333*1/5）*3,这道题有简便运算吗
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=333*3*1/5
=999*1/5
=(1000-1)*1/5
=1000*1/5-1*1/5
=200-1/5
=199+1-1/5
=199+4/5
=199又5分之4