数学题​(2x-y)²-4(x+y)(x-2y)

来源:学生作业帮助网 编辑:六六作业网 时间:2024/07/07 08:15:28
数学题​(2x-y)²-4(x+y)(x-2y)数学题​(2x-y)²-4(x+y)(x-2y)数学题​(2x-y)²-4(x+y)(

数学题​(2x-y)²-4(x+y)(x-2y)
数学题​(2x-y)²-4(x+y)(x-2y)

数学题​(2x-y)²-4(x+y)(x-2y)
(2x-y)²-4(x+y)(x-2y)=4x²-4xy+y²-4(x²-xy-2y²)=9y²