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- 1cos α-cos β=-2sin[(α+β)/2]·sin[(α-β)/2] 公式怎样得到,
- 2Her performance brought down the house.
- 3通分:1/4-2x、2/x²-4、3/x²-4x+4 要清楚的过程)
- 4英语翻译
- 5victimized pupils are more likely to experienced difficulties 为什么不用experience
- 6家里电表是220V 5(60)A的 能不能带动一个4000瓦的烤箱 如果不能有什么简单而且安全的办法?
- 7一道关于高中椭圆的数学题
- 8The dishes in the restaurant are very ___(taste).We often go there.
- 9转基因鲤鱼的四倍体与正常二倍体鲤鱼杂交产生三倍体鲤鱼为什么属于染色体变异?
- 10求英语高手: 1. It is said that the earth was originally part of the sun.(用不定式改写成简单句) 2.