（3.8＋3.3÷0.15）×0.12
=（3.8+22）X0.12
=25.8X0.12
=25X0.12+0.8X0.12
=25X0.4X0.3+0.8X0.1+0.8X0.02
=10X0.3+0.08+0.016
=3+0.08+0.016
=3.096
（12.6÷0.5＋4.8）÷0.06
=（12.6X2+4.8）/0.06
=（25.2+4.8）/0.06
=30/0.06
=3000/6
=500
9.8/14
=9.8/7/2
=1.4/2
=0.7
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