作业帮去括号并化简1.4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}2.(3a³-2a²+5a+7)+(-2a²-½a+3)-(-4a³+½a²+6a-5)
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/06 10:15:24
![去括号并化简1.4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}2.(3a³-2a²+5a+7)+(-2a²-½a+3)-(-4a³+½a²+6a-5)](/uploads/image/z/8787305-65-5.jpg?t=%E5%8E%BB%E6%8B%AC%E5%8F%B7%E5%B9%B6%E5%8C%96%E7%AE%801.4xy%26%23178%3B-3x%26%23178%3By-%7B3x%26%23178%3By%2Bxy%26%23178%3B-%5B2xy%26%23178%3B-4x%26%23178%3By%2B%28x%26%23178%3By-2xy%26%23178%3B%29%5D%7D2.%283a%26%23179%3B-2a%26%23178%3B%2B5a%2B7%29%2B%28-2a%26%23178%3B-%26%23189%3Ba%2B3%29-%28-4a%26%23179%3B%2B%26%23189%3Ba%26%23178%3B%2B6a-5%29)
去括号并化简1.4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}2.(3a³-2a²+5a+7)+(-2a²-½a+3)-(-4a³+½a²+6a-5)
去括号并化简
1.4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}
2.(3a³-2a²+5a+7)+(-2a²-½a+3)-(-4a³+½a²+6a-5)
去括号并化简1.4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}2.(3a³-2a²+5a+7)+(-2a²-½a+3)-(-4a³+½a²+6a-5)
4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}
解:原式= 4xy²-3x²y-{3x²y+xy²-2xy²+4x²y-x²y+2xy²}
=4xy²-3x²y-3x²y-xy²+2xy²-4x²y+x²y-2xy²
=3xy²-9x²y