已知一次函数y1=x﹣1,二次函数y2=x2﹣mx+4(其中m>4). (1)求二次函数图象的顶点坐标(用含m的代数式表示); (2)利用函数图象解决下列问题:
(2008年汕头)松花皮蛋是我们喜爱的食品。某小组同学查阅资料得知,制皮蛋料泥的原料主要是:生石灰、纯碱、草木灰(含K2CO3)等。同学们对料泥进行了
从蒸汽机的发明和电气技术的应用带来的后果看,科学技术进步对社会发展的作用是 ①社会生产力大幅度提高
下列说法中正确的有________. A. 黑体辐射电磁波的强度按波长的分布只与黑体的温度有关 B. 结合能越大,原子核中核子结合得越牢固,原子核越稳定 C
(本小题满分14分) 已知圆的圆心在直线上,且经过点, (1)求圆的标准方程; (2)直线过点且与圆相交的弦长为,求直线的方程. (3)设为圆上一
完形填空(每题1分,共10分)Elena Desserich was a little girl. She loved to ___1___ and write. Elena dreamed of becoming an artist when she grew up—but sadly, she ___2___ had the chance t
--Must I clean the classroom now, Miss Wang?--No, you needn’t . It by Bill. A.is cleaningB.should be cleanC.was cleanedD.has been cleaned
Hobbies are very important to us. as They 1us to spend our free time and relax ourselves. 2 any hobby, life won't be as colorful it should be. Different people have different hobbies. M