计算:(2x-y)²-4(x-y)(x+2y)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/27 01:25:19
![计算:(2x-y)²-4(x-y)(x+2y)](/uploads/image/z/247454-62-4.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%282x-y%29%26sup2%3B-4%28x-y%29%28x%2B2y%29)
x){nuaT[V\Z`dkhThUj$LΆhp*mM*`rڕuvETTdA(D%LEE%DRòz 10DzPe{]_lXDԑ-$)}Bv}
p
DB ]0Q QELRâBۼ9X 溺z
计算:(2x-y)²-4(x-y)(x+2y)
计算:(2x-y)²-4(x-y)(x+2y)
计算:(2x-y)²-4(x-y)(x+2y)
(2x-y)²-4(x-y)(x+2y)
=4x²-4xy+y²-4(x²+xy-2y²)
=4x²-4xy+y²-4x²-4xy+8y²
=9y²-8xy
=y(9y-8x)
9y2-8xy 采纳谢谢
(2x-y)²-4(x-y)(x+2y)
=4x²-4xy+y² -4(x²+ 2xy-xy+2y²)
= 4x²-4xy+y² - 4(x² + xy+2y²)
= 4x²-4xy+y²-4x²-4xy-8y²
= -8xy-7y²
=-y(8x+7y)