R²=18.7²+(R-7.2)²怎么解?
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/11 09:44:09
![R²=18.7²+(R-7.2)²怎么解?](/uploads/image/z/12869681-41-1.jpg?t=R%26%23178%3B%EF%BC%9D18.7%26%23178%3B%2B%EF%BC%88R-7.2%EF%BC%89%26%23178%3B%E6%80%8E%E4%B9%88%E8%A7%A3%3F)
x)RS64~g9~OG=g
}OvvX&HtMv6d|w<Ϧ|}5O?|]lPCI+XF6XFn6@HYX$ف
R²=18.7²+(R-7.2)²怎么解?
R²=18.7²+(R-7.2)²怎么解?
R²=18.7²+(R-7.2)²怎么解?
移项,用平方差公式化简.
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