决策的正确与否在很大程度上决定了组织的兴衰存亡,所以决策只能成功不能失败。()
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盈亏平衡点分析法适用于风险型决策。()
A. 正确
B. 错误
In the preceding figure, each of the four squares has sides of length 2x. If triangle PQR
设三阶矩阵A的特征值为λ1=-1,λ2=0,λ3=1,则下列结论不正确的是().
A. 矩阵A不可逆
B. 矩阵A的秩为零
C. 特征值-1,l对应的特征值向量正交
D. 方程组AX=0的基础解系含有一个线性无关的解向量
For senior class pictures, a photographer charges x dollars to make a negative, 7x/10 dollars for each of the first 20 prints, and x/10 dollars for each print in excess of 20 prints. If $80 is the total charge to make a negative and 30 prints, what is the value of x?
A. 3
B. 4
C. 5
D. 6
E. 7