请采纳
(0.15÷3/8+5)×1/4=(0.15×8/3+5)×1/4=(0.4+5)×1/4=5.4×1/4=1.35
[(0.15÷3/8)+5]×1/4=[(0.15×8/3)+5]×1/4=(4+5)×1/4=9×1/4=9/4
(0.15÷3/8+5)x1/4=(3/20X8/3+5)x1/4=(2/5+5)x1/4=27/5x1/4=27/20