0.87除以括号1.5÷12÷括号完除以80.87÷（1.5÷12）÷8=0.87÷0.125÷8=0.87÷（0.125*8）=0.87÷1=0.87
0.87/(1.5/12)/8＝0.87/0.125/8＝6.96/8＝0.87
