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【单选题】
删除在销售量不变的情况下,保本点越低,( )A.
盈利区的面积越大，亏损区的面积越小
B.
只引起盈利区的变化
C.
盈利区的面积越小，亏损区的面积越大
D.
只引起亏损区的变化
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【简答题】已知：2x=4 y+1 ，27y=3 x﹣1 ，求x﹣y的值
【简答题】A．She Was too busy to remember if she had returned them. B．She didn't return them in fact. C．She gave them to the landlord to return. D．She did return them but somehow the library made a mistake.
【简答题】根据句意选择正确的单词。 1. She likes drawing and math. She can design cars. She is an ____________. [ ] A. engineer B. salesperson C. cleaner 2. He enjoys math. He helps the bank use their money well. He is ...
【简答题】A．She was too busy to remember if she had returned them. B．She didn't return them in fact. C．She gave them to the landlord to return. D．She did return them but somehow the library made a mistake.
【单选题】下列各式中,去括号或添括号正确的是( ) A . a 2 -( 2a - b+c ) =a 2 - 2a - b+c B . - 2x - t - a+1= -( 2x - t ) + ( a - 1 ) C . 3x - [5x -( 2x - 1 ) ]=3x - 5x - 2x+1 D . a - 3x+2y - 1=a+ (- 3x+2y - 1 )
A.
a 2 ﹣（ 2a ﹣ b+c ） =a 2 ﹣ 2a ﹣ b+c
B.
﹣ 2x ﹣ t ﹣ a+1= ﹣（ 2x ﹣ t ） + （ a ﹣ 1 ）
C.
3x ﹣ [5x ﹣（ 2x ﹣ 1 ） ]=3x ﹣ 5x ﹣ 2x+1
D.
a ﹣ 3x+2y ﹣ 1=a+ （﹣ 3x+2y ﹣ 1 ）
【简答题】先化简，再求值，（3x+2）（3x﹣2）﹣5x（x﹣1）﹣（2x﹣1） 2 ，其中 ．
【简答题】（1）计算：（1）（﹣4） 3 ﹣4×（﹣ ） 2 （2）化简：2x﹣（3x﹣ ）+[5x﹣ （x﹣2）] （3）解方程：y﹣ = y﹣2．
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