15.32*4+4.68/0.25
=4*(15.32+4.68)
=4*20
=80
15/（0.15*0.4）
=15/0.15 * 1/0.4
=100/0.4
=250
5.3+0.1+5.3-0.1
=5.3+5.3+0.1-0.1
=10.6+0
=10.6
0.73-0.25+0.73+0.25
=0.73+0.73-0.25+0.25
=1.46+0
=1.46
27.38-5.34+2.62-4.66
=27.38+2.62-(5.34+4.66)
=30-10
=20