作业帮用简便方法计算快
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/02 12:20:22
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用简便方法计算快
用简便方法计算快
用简便方法计算快
0.56x99
=0.56x(100-1)
=0.56x100-0.56x1
=56-0.56
=55.44
4.2x9.9
=4.2x(10-0.1)
=4.2x10-4.2x0.1
=42-0.42
=41.58