用简便方法计算:3.5²+60×3.5×1.5+1.5²
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/03 10:36:33
![用简便方法计算:3.5²+60×3.5×1.5+1.5²](/uploads/image/z/388605-21-5.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%9A3.5%26%23178%3B%2B60%C3%973.5%C3%971.5%2B1.5%26%23178%3B)
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用简便方法计算:3.5²+60×3.5×1.5+1.5²
用简便方法计算:3.5²+60×3.5×1.5+1.5²
用简便方法计算:3.5²+60×3.5×1.5+1.5²
3.5²+60×3.5×1.5+1.5²
=3.5²+2×3.5×1.5+1.5²+58×3.5×1.5
=(3.5+1.5)²+58×3.5×1.5
=25+58×3.5×1.5
=25+29×7×1.5
=25+(30-1)×10.5
=25+30×10.5-1×10.5
=25+315-10.5
=340-10.5
=329.5