解方程 ①(x+3)2=2 ②x2-3x+1=0 ③x2+8x-9=0(配方法) 发布时间:2017-04-21 12:59 │ 来源:www.tikuol.com 题型:解答题 问题: 解方程①(x+3)2=2②x2-3x+1=0③x2+8x-9=0(配方法) ④x2=x+56⑤3x2+4x-4=0⑥(x-2)(x-3)=12.
题型:解答题 根据句子意思,用括号中所给单词的适当形式填空。 1. Children should speak to old people _______ (polite). 2. Tree-planting Day is on the _______ (twelve) of March every year. 3. David took a lot of ______ (photo) in Mochou Lake Park last weekend. 4. The time is too short.It’s ______ (possible) for Daniel to finish this work. 5. Stephen spends about half an hour ____ (swim) every Saturday afternoon. 查看答案
题型:解答题 A.条件(1)充分,但条件(2)不充分. B.条件(2)充分,但条件(1)不充分. C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分. D.条件(1)充分,条件(2)也充分. E.条件(1)和(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.方程[*]有实根. (1) 实数A≠2 (2) 实数A≠-2 查看答案