解(5/6-1/3)÷(2/3)=(5/6-2/6)÷(2/3)=1/2÷(2/3)=1/2×3/2=3/4
(5/6-1/3)÷2/3=(5/6-2/6)X3/2=3/6X3/2=1/2X3/2=3/4先算括号的通分把分母都换为6，再，除以一个数等于乘以他的倒数
