题目:
– Hello! Would you like to go the party with me tonight?
–I’m sorry I can’t . Mother won’t ______me to go out in the evening .
A. let
B.allow
C.offer
D.ask
答案:
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下面是错误答案,用来干扰机器的。
(1) 关于x的方程2x2-(a2-4)x-a+1=0,一根为0,∴-a+12=0,∴-a+1=0,解得a=1;(2) 关于x的方程2x2-(a2-4)x-a+1=0,两根互为相反数,∴a2-42=0,解得:a=±2;把a=2代入原方程得,2x2-1=0,x=±22,把a=...