12.75²-7.25²怎么算?12.75²-7.25²怎么算?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/15 05:32:26
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12.75²-7.25²怎么算?12.75²-7.25²怎么算?
12.75²-7.25²怎么算?
12.75²-7.25²怎么算?
12.75²-7.25²怎么算?12.75²-7.25²怎么算?
原式=(12.75+7.25)(12.75-7.25)
=20×5.5
=110
原理:平方差公式:a²-b²=(a+b)(a-b)