1、
5x5+3x3=25+9=34
10寸加6寸都虧了,更何況9寸加6寸
2、
要真的算出4.5x4.5,比所謂速算法還有更簡單快捷的方法
4.5x4.5=(9x9)/4=81/4=20.25
1、
5x5+3x3=25+9=34
10寸加6寸都虧了,更何況9寸加6寸
2、
要真的算出4.5x4.5,比所謂速算法還有更簡單快捷的方法
4.5x4.5=(9x9)/4=81/4=20.25
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