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【利用分解因式:1-2345²+0.7655²+2.469×0.7655】
题目内容:
利用分解因式:1-2345²+0.7655²+2.469×0.7655优质解答
0.2345²+0.7655²+2.469×0.7655
=0.2345^2+2*0.2345*0.7655+0.7655^2
=(0.2345+0.7655)^2
=1^2
=1 - 追问:
- 是一减后面的。。漏掉了
- 追答:
- 1-[0.2345²+0.7655²+2.469×0.7655] =1-[0.2345^2+2*0.2345*0.7655+0.7655^2] =1-(0.2345+0.7655)^2 =1-1^2 =(1+1)(1-1) =2*0 =0
- 追问:
- 减号后面加括号里面符号要变号吧。。
- 追答:
- 我晕了 你的题目是:1-2345²+0.7655²+2.469×0.7655还是 1-0.2345²+0.7655²+2.469*0.7655还是1-(2345²+0.7655²+2.469×0.7655)还是啊1.2345²+0.7655²+2.469×0.7655 ~~~到底是哪一个?? 1-0.2345²+0.7655²+2.469*0.7655 =(1+0.2345)(1-0.2345)+0.7655+2.469*0.7655^2 =(1.2345+0.7655+2.469)*0.7655 =。。。。 1.2345²+0.7655²+2.469×0.7655这个看我下楼的
- 追问:
- 呵呵。。。。是1-23452+0.76552+2.469×0.7655
- 追答:
- 2345^2....这个还是用计算器算吧~~~我晕了 为啥不是1-0.2345^2
优质解答
=0.2345^2+2*0.2345*0.7655+0.7655^2
=(0.2345+0.7655)^2
=1^2
=1
- 追问:
- 是一减后面的。。漏掉了
- 追答:
- 1-[0.2345²+0.7655²+2.469×0.7655] =1-[0.2345^2+2*0.2345*0.7655+0.7655^2] =1-(0.2345+0.7655)^2 =1-1^2 =(1+1)(1-1) =2*0 =0
- 追问:
- 减号后面加括号里面符号要变号吧。。
- 追答:
- 我晕了 你的题目是:1-2345²+0.7655²+2.469×0.7655还是 1-0.2345²+0.7655²+2.469*0.7655还是1-(2345²+0.7655²+2.469×0.7655)还是啊1.2345²+0.7655²+2.469×0.7655 ~~~到底是哪一个?? 1-0.2345²+0.7655²+2.469*0.7655 =(1+0.2345)(1-0.2345)+0.7655+2.469*0.7655^2 =(1.2345+0.7655+2.469)*0.7655 =。。。。 1.2345²+0.7655²+2.469×0.7655这个看我下楼的
- 追问:
- 呵呵。。。。是1-23452+0.76552+2.469×0.7655
- 追答:
- 2345^2....这个还是用计算器算吧~~~我晕了 为啥不是1-0.2345^2
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