1/4x(4.85÷5/18-5.15x3又3/5)+{5.5-1.75x(1又2/3+19/21）}
问题描述：
1/4x(4.85÷5/18-5.15x3又3/5)+{5.5-1.75x(1又2/3+19/21）}
答
1/4x(4.85÷5/18-5.15x3又3/5)+{5.5-1.75x(1又2/3+19/21）}=1/4×(4.85×18/5-5.15×18/5)+[5.5-7/4×(5/3+19/21)]=1/4×18/5×(4.85-5.15)+5.5-7/4×54/21=0.9×(-0.3)+5.5-4.5=-0.27+1=0.73