44.4×0.33+2.33×3.4＝44.4×0.33+0.33×3.4+2×3.4＝（44.4+3.4）×0.33+6.8＝(50-1-0.2)×0.33＝50×0.33-1×0.33-0.2×0.33+6.8＝16.5-0.33-0.066+6.8＝16.5+6.8-（0.33+0.066）＝23.3-(0.4-0.004)＝23.3-0.4+0.004＝22.904
