将下列各代数式分别填入它们所属的集合:4xy,x2+x-23,m2n2,-1x, 发布时间:2017-05-24 14:10 │ 来源:www.tikuol.com 题型:填空题 问题: 将下列各代数式分别填入它们所属的集合:4xy,x2+x-23,m2n2,-1x,y2 +y+ 2y,2x3-3,0,-3ab+a,m,m-nm+n,x-12整式集合{ …},分式集合{ …},多项式集合{ …},单项式集合{ …}.
题型:填空题 —The bell rang for a long time. Why not answer it?—I ______ taking a bath on the second floor. [ ]A. is B. was C. were D. are 查看答案
题型:填空题 He checked out his composition again and again to make sure that no important points had been_______.[ ]A.found out B.run out C.made out D.left out 查看答案