0.111×5.5+0.555×0.9
=0.111×5.5+0.111×4.5
=0.111×（5.5+4.5）
=0.111×10
=1.11
37.5×7.1+500×0.29+1.1×12.5
=37.5×7.1+50×2.9+1.1×12.5
=37.5×7.1+37.5×2.9+12.5×2.9+12.5×1.1
=37.5×（7.1+2.9）+12.5×（2.9+1.1）
=37.5×10+12.5×4
=375+50
=4253.75×7.2+63.5×0.72-0.01×72简便计算