R²=18.7²+(R-7.2)²
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/15 04:56:08
![R²=18.7²+(R-7.2)²](/uploads/image/z/13561595-35-5.jpg?t=R%26%23178%3B%3D18.7%26%23178%3B%2B%EF%BC%88R-7.2%EF%BC%89%26%23178%3B)
R²=18.7²+(R-7.2)²
R²=18.7²+(R-7.2)²
R²=18.7²+(R-7.2)²
R²=18.7²+(R-7.2)²;
R²-(R-7.2)²=18.7²;
(R+R-7.2)(R-R+7.2)=18.7²;
(2R-7.2)*7.2=18.7²;
R=27.88
展开:
R²=18.7²+R²-14.4R+7.2²-------约去R²得到下式
14.4R=18.7²+7.2²
R≈27.88
希望能帮到你~