题目多项式4xmyn−1+8x3myn4x^{m}y^{n-1}+8x^{3m}y^{n}4xmyn−1+8x3myn中各项的公因式是（ ）A.xmynx^{m}y^{n}xmynB.xmyn−1x^{m}y^{n-1}xmyn−1C.4xmyn4x^{m}y^{n}4xmynD.4xmyn−14x^{m}y^{n-1}4xmyn−1知识点：公因式章节：数与式 / 因式分解
