(1)化简:x2-9x2+6x+9•12x-6(2)解方程:7x-2=5x. 发布时间:2017-05-19 15:37 │ 来源:www.tikuol.com 题型:解答题 问题: (1)化简:x2-9x2+6x+9•12x-6(2)解方程:7x-2=5x.
题型:解答题 ----- As we know, you won’t go back to the USA since you have established a research center here.But how long _____ in America? ----- For almost 10 years.A.did you studyB.have you studiedC.were you studyingD.have you been studying 查看答案