R²=297.5²+(R-180)²怎么求?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 19:01:17
![R²=297.5²+(R-180)²怎么求?](/uploads/image/z/5902195-67-5.jpg?t=R%26%23178%3B%3D297.5%26%23178%3B%2B%28R-180%29%26%23178%3B%E6%80%8E%E4%B9%88%E6%B1%82%3F)
R²=297.5²+(R-180)²怎么求?
R²=297.5²+(R-180)²怎么求?
R²=297.5²+(R-180)²怎么求?
原方程为:R²=297.5²+(R-180)²
R²-(R-180)²=297.5²
[R-(R-180)]*[R+(R-180)]=297.5²
180*2R-180²=297.5²
R=(297.5²+180²)/360
=335.850694444.
R²=297.5²+(R-180)²
R²=88506.25+R²+32400-360R
360R=120906.25
R≈335.85
R²=297.5²+(R-180)²
移项有:R²-(R-180)²=297.5²
利用平方差公式化简得:180(2R-180)=297.5²
变形得到:R=(1/2){[(297.5²)/180]+180}≈335.8570