问题 选择题 化简(x3yz)2÷(-xzy)•yx2z,结果是( )A.y2z2x2B.-x5y2z3C.-x3y4z4D.x4z3z2 答案 (x3yz)2÷(-xzy)•yx2z=-x6y2z2•yxz•yx2z=-x3y4z4,故选C.