先化简,再求值:3x2y-[2xy2-2(xy-x2y)]+2xy2,其中x=3 发布时间:2017-05-20 20:08 │ 来源:www.tikuol.com 题型:解答题 问题: 先化简,再求值:3x2y-[2xy2-2(xy-x2y)]+2xy2,其中x=3,y=-1.
题型:解答题 There is _____ pollution in the world. We must stop it.A.much tooB.too manyC.many tooD.too much 查看答案