A:充分不必要条件
B:必要不充分条件
C:充要条件
D:既不充分也不必要条件
若代数式4x2-2x+5=7,那么代数式2x2-x+1的值等于()
- Don't talk in class, please.
- Sorry, I__________.
小明解不等式 1+x2−2x+13≤1 的过程如图.请指出他解答过程中错误步骤的序号,并写出正确的解答过程.
What can we infer from Shelly-Ann's statement underlined in Paragraph 5?