为什么(1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0?1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3 (1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0这是怎么转换的?解释一下,前面根本减不了,急!
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/26 01:14:49
![为什么(1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0?1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3 (1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0这是怎么转换的?解释一下,前面根本减不了,急!](/uploads/image/z/364696-16-6.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%88%281998-2009%29%2F11-%281998%2B11%29%2F2009%2B%2811-2009%EF%BC%89%2F1998%2B3%3D3-1-1-1%3D0%3F1998%C3%97%281%2F11-1%2F2009%29%2B11%C3%97%281%2F1998-1%2F2009%29-2009%C3%97%281%2F11%2B1%2F1998%29%2B3++%281998-2009%29%2F11-%281998%2B11%29%2F2009%2B%2811-2009%EF%BC%89%2F1998%2B3%3D3-1-1-1%3D0%E8%BF%99%E6%98%AF%E6%80%8E%E4%B9%88%E8%BD%AC%E6%8D%A2%E7%9A%84%3F%E8%A7%A3%E9%87%8A%E4%B8%80%E4%B8%8B%2C%E5%89%8D%E9%9D%A2%E6%A0%B9%E6%9C%AC%E5%87%8F%E4%B8%8D%E4%BA%86%2C%E6%80%A5%21)
为什么(1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0?1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3 (1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0这是怎么转换的?解释一下,前面根本减不了,急!
为什么(1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0?
1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3 (1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0这是怎么转换的?解释一下,前面根本减不了,急!
为什么(1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0?1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3 (1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3=3-1-1-1=0这是怎么转换的?解释一下,前面根本减不了,急!
1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3
=1998/11-1998/2009+11/1998-11/2009-2009/11-2009/1998+3(把3挪到最前面)
=3+(1998/11-2009/11)+(11/1998-2009/1998)-(1998/2009+11/2009)
=3-11/11-1998/1998-2009/2009
=3-1-1-1
=0
(1998-2009)/11-(1998+11)/2009+(11-2009)/1998+3
=-11/11-2009/2009+(-1998/1998)+3
=-1-1-1+3
=0