如图,为正方形边上任一点,于点,在 的延长线上取点,使,连接,.(1)求证:;(2)的平分线交于点,连接,求证:;
(广安)计算:.
(广元)计算:.
(绵阳)计算:.
(眉山)(本小题满分6分)计算:.
(泸州)计算:.