看不惯淘宝上有的卖家把答案pdf卖的很贵,分享出来,还有没有积分了,所以收2积分哈哈.Dr.RonLarsonisaprofessorofmathematicsatThePennsylvaniaStateUniversity,wherehehastaughtsince1970.HereceivedhisPh.D.inmathematicsfromtheUniversityofColoradoandisconsideredthepioneerofusingmultimediatoenhancethelearningofmathematics,havingauthored