先化简在计算 3x³-【x³+(6x²-7x)】-2(x³-3x²-4x)其中x=-1
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 18:15:35
![先化简在计算 3x³-【x³+(6x²-7x)】-2(x³-3x²-4x)其中x=-1](/uploads/image/z/581651-35-1.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%9C%A8%E8%AE%A1%E7%AE%97+3x%26%23179%3B-%E3%80%90x%26%23179%3B%2B%286x%26%23178%3B-7x%29%E3%80%91-2%28x%26%23179%3B-3x%26%23178%3B-4x%29%E5%85%B6%E4%B8%ADx%3D-1)
先化简在计算 3x³-【x³+(6x²-7x)】-2(x³-3x²-4x)其中x=-1
先化简在计算 3x³-【x³+(6x²-7x)】-2(x³-3x²-4x)其中x=-1
先化简在计算 3x³-【x³+(6x²-7x)】-2(x³-3x²-4x)其中x=-1
3x³-【x³+(6x²-7x)】-2(x³-3x²-4x)
=3x³-x³-6x²+7x-2x³+6x²+8x
=15x
=15x(-1)
=-15
3x³-【x³+(6x²-7x)】-2(x³-3x²-4x)
=3x³-x³-(6x²-7x)-2(x³-3x²-4x)
=3x³-x³-6x²+7x-2x³+6x²+8x
=15x
当x=-1时
原式=-15