5x²+4x-1为什么=5((x+2/5)²-9/25)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 05:23:10
![5x²+4x-1为什么=5((x+2/5)²-9/25)](/uploads/image/z/994084-52-4.jpg?t=5x%26%23178%3B%2B4x-1%E4%B8%BA%E4%BB%80%E4%B9%88%3D5%EF%BC%88%28x%2B2%2F5%29%26%23178%3B-9%2F25%EF%BC%89)
5x²+4x-1为什么=5((x+2/5)²-9/25)
5x²+4x-1为什么=5((x+2/5)²-9/25)
5x²+4x-1为什么=5((x+2/5)²-9/25)
配方法:
5x²+4x-1
=5(x²+4/5x-1/5)
=5[(x+2/5)²-4/25-1/5]
=5[(x+2/5)²-9/25]
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来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 05:23:10
5x²+4x-1为什么=5((x+2/5)²-9/25)
5x²+4x-1为什么=5((x+2/5)²-9/25)
5x²+4x-1为什么=5((x+2/5)²-9/25)
配方法:
5x²+4x-1
=5(x²+4/5x-1/5)
=5[(x+2/5)²-4/25-1/5]
=5[(x+2/5)²-9/25]