4×125％－[(18一3又3/4×1.2×4)×25－1.5÷0.1]÷（1又1/2)
=5-[(18-15/4*6/5*4)*25-15]/(3/2)
=5-(-15)/(3/2)
=5-(-10)
=15
不知道能不能看懂呢