1/4*(4.85除以5/18-3.6+6.15*3又3/5)—[1.75*(1又3/2+19/21)-5.5]

问题描述:

1/4*(4.85除以5/18-3.6+6.15*3又3/5)—[1.75*(1又3/2+19/21)-5.5]