R²=297.5²+(R-180)²怎么求?

问题描述:

R²=297.5²+(R-180)²怎么求?

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

R²=297.5²+(R-180)²
R²=88506.25+R²+32400-360R
360R=120906.25
R≈335.85

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.