4×（1/12+3/16）-3/4 =1/3+3/4-3/4=1/37/5-5/8-9/16÷3/2=7/5-5/8-3/8=7/5-(5/8+3/8)=7/5-1=2/524*(1/4+1/6-1/3)=6+4-8=25/6×3/4+1/6÷4/3=5/6*3/4+1/6*3/4=3/4(5/6+1/6)=3/4