用拉格朗日乘数法求三元函数在单位球面的赤道线（曲线）上的最值，应该按以下方式构造拉格朗日函数
A、
B、
C、
D、

单项选择题Alpha received a statement of account from a supplier Beta, showing a balance to be paid of 4,140. Investigation reveals the following: (1) cash paid to Beta of 40 of cash discount disallowed by Beta What discrepancy remains between Alpha’s and Beta’s records after allowing for these items?

单项选择题A、18 B、27 C、9 D、3