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【简答题】
已知：x：y：z=2：3：4，且xy+yz+xz=104，求2x 2 +12y 2 ﹣9z 2 的值．
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反馈参考答案：
举一反三
【单选题】His peers admonished him that he had to increase his study time as the final examination was around the corner.
A.
astonished
B.
warned
C.
threatened
D.
alarmed
【简答题】Do you know there is an earthquake every thirty seconds in the world? But don’t worry because most of them are so small that they cannot be felt. Only a few hurt people. Many earthquakes happen in Chi...
【简答题】What did Jules Hirsch do in his study?
【单选题】With his attention _____ on his book, he didn’t notice me enter his study.
A.
focusing
B.
focused
C.
to focus
D.
focus
【单选题】By upsetting the balance of the climax stage, man will ______ the indiscriminate hunting of whales for food.
A.
encourage
B.
support
C.
reduce
D.
prohibit
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