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【简答题】
（1）化简求值：4（x 2 +y）（x 2 -y）-（2x 2 -y） 2 ，其中x=2，y=-5； （2）已知：2x-y=2，求：[（x 2 +y 2 ）-（x-y） 2 +2y（x-y）]÷4y。
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反馈参考答案：
举一反三
【单选题】钢筋切断机两刀片之间的间隙控制在( )范围内,太大时应在固定刀下面加垫调节。
A.
0.2~0.5mm
B.
0.2~0.4mm
C.
0.3~0.5mm
D.
0.1~0.4mm
【简答题】E-R模型转化为关系模式应遵循的原则是什么?
【简答题】保健推拿的禁忌症三：某些传染病的（ ）期，如肺结核、乙型肝炎等。
【简答题】保健推拿的禁忌症三:某些( )病的( )期,如肺结核、乙型肝炎等;
【单选题】My brother ______ while he ______ his bicycle and hurt himself.
A.
fell, was riding
B.
fell, were riding
C.
had fallen, rode
D.
had fallen, was riding
【单选题】He insisted that his brother ______ the window. It was clear that someone else broke the window.
A.
should not break
B.
should not have broken
C.
hadn't broken
D.
would not break
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