作业帮化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
来源：学生作业帮助网 编辑：作业帮 时间：2024/06/08 16:46:45
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化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
解
原式
=(3x²+xy-9xy-3y²)-(4x²-12xy)+9y²)
=(3x²-8xy-3y²)-(4x²-12xy+9y²)
=(3x²-4x²)+(-8xy+12xy)+(-3y²-9y²)
=-x²+4xy-12y²
-x^2-12y^2+4xy
想弱弱的问一句，这样的题目？很难么？
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