题目内容

盈亏平衡点分析法适用于风险型决策。()

A. 正确
B. 错误

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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

If 5x-6=14, then 8x=

A. 8/5
B. 4
C. 64/5
D. 20
E. 32