Warning: file_put_contents(): Only 0 of 6041 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/201990.com/index.php on line 55 quadrilaterals例句_quadrilaterals英汉例句_quadrilaterals双解例句_耀久九英英词典
According to the principles of infinitesimal calculus,a new method on how to ratiocinate the arbitrary quadrilaterals area was put forward. 利用微积分原理给出任意四边形面积公式推证的一种新方法。