1.2345的平方+07655的平方+2.469×0.76551.2345的平方+0.7655的平方+2.469x0.7655=1.2345²+0.7655²+2×1.2345×0.7655=(1.2345+0.7655)²=2²=4答案是这样,但是为什么1.2345²+0.7655²+2×1.2345×0.7655可以转化
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 01:35:56
![1.2345的平方+07655的平方+2.469×0.76551.2345的平方+0.7655的平方+2.469x0.7655=1.2345²+0.7655²+2×1.2345×0.7655=(1.2345+0.7655)²=2²=4答案是这样,但是为什么1.2345²+0.7655²+2×1.2345×0.7655可以转化](/uploads/image/z/1030454-62-4.jpg?t=1.2345%E7%9A%84%E5%B9%B3%E6%96%B9%2B07655%E7%9A%84%E5%B9%B3%E6%96%B9%2B2.469%C3%970.76551.2345%E7%9A%84%E5%B9%B3%E6%96%B9%2B0.7655%E7%9A%84%E5%B9%B3%E6%96%B9%2B2.469x0.7655%3D1.2345%26%23178%3B%2B0.7655%26%23178%3B%2B2%C3%971.2345%C3%970.7655%3D%281.2345%2B0.7655%29%26%23178%3B%3D2%26%23178%3B%3D4%E7%AD%94%E6%A1%88%E6%98%AF%E8%BF%99%E6%A0%B7%2C%E4%BD%86%E6%98%AF%E4%B8%BA%E4%BB%80%E4%B9%881.2345%26%23178%3B%2B0.7655%26%23178%3B%2B2%C3%971.2345%C3%970.7655%E5%8F%AF%E4%BB%A5%E8%BD%AC%E5%8C%96)
1.2345的平方+07655的平方+2.469×0.76551.2345的平方+0.7655的平方+2.469x0.7655=1.2345²+0.7655²+2×1.2345×0.7655=(1.2345+0.7655)²=2²=4答案是这样,但是为什么1.2345²+0.7655²+2×1.2345×0.7655可以转化
1.2345的平方+07655的平方+2.469×0.7655
1.2345的平方+0.7655的平方+2.469x0.7655
=1.2345²+0.7655²+2×1.2345×0.7655
=(1.2345+0.7655)²
=2²
=4
答案是这样,但是为什么1.2345²+0.7655²+2×1.2345×0.7655可以转化成(1.2345+0.7655)² 呢
1.2345的平方+07655的平方+2.469×0.76551.2345的平方+0.7655的平方+2.469x0.7655=1.2345²+0.7655²+2×1.2345×0.7655=(1.2345+0.7655)²=2²=4答案是这样,但是为什么1.2345²+0.7655²+2×1.2345×0.7655可以转化
先回顾一下这个公式:
a^2+2ab+b^2=(a+b)^2.
设a=1.2345,b=0.7655.
则,1.2345^2+2×12345.×0.7655+0.7655^2=(1.2345+0.7655)^2 【^2----表示平方的符号】
这样清楚了吧.
1.2345²+0.7655²+2.469×0.7655
=1.2345²+0.7655²+2×1.2345×0.7655
=(1.2345+0.7655)²
=2²
=4