简法一：
4.44×0.75
=1.11×4×0.75
=1.11×3
=3.33
简法二：
4.44×0.75
=4.44×3/4（4与4.44约分）
=3.33
4.44x0.75=4.44x3/4=1.11x3=3.33
4.44×0.75
4×0.75 + 0.4×0.75 + 0.04×0.75
＝3 + 0.3 + 0.03
＝3.33
4.44×0.75简便运算可以把0.75化成分数
4.44×0.75
=4.44×3/4
=1.11×3
=3.33
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