这几题脱式计算怎么写要过程急死我了

2、1÷（1/4÷1/5） 3、2/3+5/12-1/6 4、(3/11)x5+(8/11)x5 5、12x(1/4x1/6-1/3)
=1÷(1/4x5) =8/12+5/12-2/12 =5x(3/11+8/11) =12x(1/24-1/3)
=1÷5/4 =(8+5-2)/12 =5x1 =12x(1/24-8/24)
=4/5 =11/12 =5 =12x(-7/24)
=-7/2
6、(3/8)x[1-(1/5-1/6)]
=(3/8)x[1-(6/30-5/30)]
=(3/8)x(1-1/30)
=(3/8)x(29/30)
=29/80