【Mimi Yu】評論
x4-1=(x2+1)(x+1)(x-1) =(x2+1)(-x+(-1))(-x-(-1)) =(x2+1)(-x-1)(-x+1) =(x2-(-1))(x+1)(x-1) =(x+(-1))(x-(-1))(x+1)(x-1) =(x+1)(x-1.....看完整詳解