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- 1小飞家更换了节水龙头后每月用水约9吨,比原来节约了1吨,每月用水比原来节约了百分之几?
- 2已知关于x的一元二次方程 ax²+bx+1=0 (a≠0)有两个相等的实数根,求 ab²/(a-2)²+b&sup
- 3---I have to be off right now.---What a pity!I ___ you could stay a little longer with us.
- 4比较下列各句中加点词语的古今义.
- 5Did you visit your relativea last May day?(用friends改为选择疑问句)
- 6日食和月食是在月球公转过程中产生的自然现象,
- 7在直角坐标系中,坐标原点为O,已知A(-2,4),B(4,2). (1)求△AOB的面积; (2)在x轴上找点P,使PA+PB的值最小,求P点的坐标.
- 8-1,2,-3,4,-5,6,···1,4,9,16,25···0,3,8,15,24···第一行按什么规律排列?第二三行分别与第一行有
- 9英语翻译:学好英语对我们很有用.
- 10What a pity my new computer doesn't work ___must be something wrong with it