作业帮化简：(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,（x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简，不是计算！
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 20:10:06
![化简：(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,（x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简，不是计算！](/uploads/image/z/1116581-5-1.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9A%28x%2By%29%28x-y%29-2%284-y%5E2%2B1%2F2x%5E2%29+%E8%B5%B6%E7%B4%A7%E5%9B%9E%E7%AD%94%E5%90%A7%2C%EF%BC%88x%2By%29%28x-y%29-2%5B4-y%5E2%2B%281%2F2%29x%5E2%5D+%E6%98%AF%E5%8C%96%E7%AE%80%EF%BC%8C%E4%B8%8D%E6%98%AF%E8%AE%A1%E7%AE%97%EF%BC%81)
化简：(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,（x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简，不是计算！
化简：(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,
（x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简，不是计算！
化简：(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,（x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简，不是计算！
x+y)(x-y)-2(4-y^2+1/2x^2) =x^2-y^2-8+2y^2-x^2=y^2-8