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【简答题】
设 M 是把坐标平面上的点的横坐标伸长到2倍，纵坐标伸长到3倍的伸压变换． (1)求矩阵 M 的特征值及相应的特征向量； (2)求逆矩阵 M －1 以及椭圆 ＝1在 M －1 的作用下的新曲线的方程．
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反馈参考答案：
举一反三
【单选题】公式 ∆ H=Q p 适用于下列过程中的( )
A.
理想气体从 1013.25kPa反抗恒定外压101.325kPa膨胀
B.
273K，101.325kPa下冰融化成水
C.
298K，101.325kPa下电解CuSO 4 水溶液
D.
气体从状态 I 等温可逆变化到状态 II
【简答题】American schoolkids attend school for fewer days than children in other educationally advanced countries , a situation President Obama said Monday needs to change. "I think we should have a longer sch...
【单选题】President Obama said, “Steve was among the greatest of American ( )”
A.
investigations
B.
dictators
C.
elevators
D.
innovators
【简答题】Passage A American schoolkids attend school for fewer days than children in other educationally advanced countries, a situation President Obama said Monday needs to change. I think we should have a lo...
【单选题】President Obama said there is no ____________ that all the steps agreed to at the meeting will work, but he thought they applied the right medicine.
A.
participation
B.
appreciation
C.
guarantee
D.
procedure
【单选题】The US president Obama said his country will sign a peace treaty with the DPRK (朝鲜) _____ the latter gets rid of all its nuclear facilities. [ ]
A.
while
B.
even if
C.
so that
D.
provided
【单选题】President Obama said the U.S.government must be able to act _______ when information surfaces about a potential threat.
A.
decisively
B.
spiritually
C.
exclusively
D.
capriciously
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