(-2x-1)²-4(x-1)(x+2),怎么算?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 16:10:34
![(-2x-1)²-4(x-1)(x+2),怎么算?](/uploads/image/z/8625432-48-2.jpg?t=%28-2x-1%29%26%23178%3B-4%28x-1%29%28x%2B2%29%2C%E6%80%8E%E4%B9%88%E7%AE%97%3F)
(-2x-1)²-4(x-1)(x+2),怎么算?
(-2x-1)²-4(x-1)(x+2),怎么算?
(-2x-1)²-4(x-1)(x+2),怎么算?
原式=(2x+1)²-4(x²+x-2)
=4x²+4x+1-4x²-4x+8
=9
=4x²+4x+1-4(x²+x-2)
=4x²+4x+1-4x²-4x+8
=9
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来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 16:10:34
(-2x-1)²-4(x-1)(x+2),怎么算?
(-2x-1)²-4(x-1)(x+2),怎么算?
(-2x-1)²-4(x-1)(x+2),怎么算?
原式=(2x+1)²-4(x²+x-2)
=4x²+4x+1-4x²-4x+8
=9
=4x²+4x+1-4(x²+x-2)
=4x²+4x+1-4x²-4x+8
=9