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【简答题】
（1）已知x 2 -3x-4=0，试求-3x 2 +9x+47的值． （2）已知y 2 -2y-3=0的两个根是y 1 ，y 2 ，求代数式y 1 2 +y 2 2 -2y 1 -2y 2 的值．
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举一反三
【简答题】Now many loved couples like to celebrate their wedding a____________.
【单选题】Which of the following has the same meaning with the word "tie" in "in the case of tie"?
A.
Jane and I tied (for first place) in the spelling test.
B.
Her job ties her to the east coast.
C.
He always wears a jacket and tie to work.
D.
I no longer feel any ties with my hometown.
【单选题】In the case of a "no-show", the ______ cost of the reservation will be charged.
A.
altogether
B.
all together
C.
general
D.
total
【单选题】Now all Chinese couples ______ to have two kids.
A.
are allowed
B.
were allowed
C.
allow
D.
have allowed
【单选题】Now all Chinese couples ___to have two children.
A.
allow
B.
are allowed
C.
allowed
D.
were allowed
【单选题】Now all Chinese couples _____________to have two children.
A.
allow
B.
allowed
C.
are allowed
D.
were allowed
【单选题】Because of me, 60 couples are now happily married or ________.
A.
encouraged
B.
engaged
C.
in caged
【简答题】一块无色透明具有柱状外形的矿物,要求判断是方解石还是石英,写出可用的鉴定方法。
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