题型:判断题 化简或求值(1)2a-5b+3a+b;(2)5(3a2b-ab2)-4(-3ab2+2a2b),其中a=-2,b=3.(3)如果代数式(2x2+ax-y+6)-(2bx2-3x+5y-1)的值与字母x所取的值无关,试求代数式a-2b的值. 查看答案
题型:判断题 When I went into the hall, I saw a little girl ______ up and down. [ ]A. to jumpB. jumping C. jumped D. jumps 查看答案