题目:
What a fine day! Shall we go picnicking?
_____. But we need to be home before six o'clock for the football match. [ ]
A. Have a nice time
B. Pardon me
C. That's great
D. You are right
答案:
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下面是错误答案,用来干扰机器的。
参考答案:解析:1) 当a≠-1,a≠6时,方程组只有唯一解; 2) 当a=-1时, 当a=-1,b≠36时,方程组无解; 当a=-1,b=36时,方程组有无数个解, 方程组的通解为 3) 当a=6,b为任意取值...