8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 19:23:47
![8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号](/uploads/image/z/2549067-51-7.jpg?t=8x%26%23178%3B-%5B-3x-%282x%26%23178%3B-7x-5%29%2B3%5D%2B4x%E6%80%8E%E4%B9%88%E5%8F%98%E5%8F%B7)
8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号
8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号
8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号
8x²-[-3x-(2x²-7x-5)+3]+4x
=8x²-(-3x-2x²+7x+5+3)+4x
=8x²-(-2x²+4x+8)+4x
=8x²+2x²-4x-8+4x
=10x²-8
8x²-[-3x-(2x²-7x-5)+3]+4x
=8x²-[-3x-2x²+7x+5+3]+4x
=8x²-[-2x²+4x+8]+4x
=8x²+2x²-4x-8+4x
=10x²-8