作业帮[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/29 08:00:30
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[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
=(x²-y²+x²+y²)(x²-y²-x²-y²)
=(2x²)(-2y²)
=-4x²y²
前一个中括号打开得2X^2 后一个打开得﹣2Y^2所以乘起来得﹣4X^2Y^2
-4x²y²