用简便方法计算:27.5²-55×12.5+12.5²
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/20 21:04:53
![用简便方法计算:27.5²-55×12.5+12.5²](/uploads/image/z/128501-53-1.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%9A27.5%26%23178%3B-55%C3%9712.5%2B12.5%26%23178%3B)
用简便方法计算:27.5²-55×12.5+12.5²
用简便方法计算:27.5²-55×12.5+12.5²
用简便方法计算:27.5²-55×12.5+12.5²
:27.5²-55×12.5+12.5²
=27.5²-2×27.5×12.5+12.5²
=(27.5-12.5)²
=15²
=225
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来源:学生作业帮助网 编辑:作业帮 时间:2024/06/20 21:04:53
用简便方法计算:27.5²-55×12.5+12.5²
用简便方法计算:27.5²-55×12.5+12.5²
用简便方法计算:27.5²-55×12.5+12.5²
:27.5²-55×12.5+12.5²
=27.5²-2×27.5×12.5+12.5²
=(27.5-12.5)²
=15²
=225