脱式计算7/12÷(5÷5/12)=7/12÷12=7/144
计算过程如下：＝7/12÷(5×12/5)＝5/12÷12＝5/12×1/12＝5/144
7/12÷(5÷5/12)=7/12÷(5×12/5)=7/12÷12=7/12×1/12=7/144
