下列合并同类项的计算中，正确的是( ) A．3a2﹣2a2=a2 B．3a2﹣2a_爱下问搜题

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问题选择题

下列合并同类项的计算中，正确的是( )

A．3a²﹣2a²=a²B．3a²﹣2a²=1
C．3a²﹣a²=3
D．3a²﹣a²=2a

答案

答案：A

完形填空

补全对话。

Sarah: Hey, Lucy! Wait!
Lucy: Hi, Sarah! How are you?
Sarah: Fine, thank you. 1_______
Lucy: I'm on duty today, so I have to go to school earlier to do my work.
Sarah: 2_______
Lucy: Today I must water the flowers in our classroom.
Sarah: What kinds of flowers do you have?
Lucy: 3_______ I like flowers very much.
Sarah: 4_______ Can I help you?
Lucy: Sure! 5_______

( )1. A. Did you have
              breakfast?
( )2. A. Where are you
                 going?
( )3. A. The flowers are
              really good.
( )4. A. I like animals, too.
( )5. A. My work is going to be
               more interesting.

B. Why are you
walking so fast?
B. What do you
     have to do?
B. Do you like
    flowers?
B. Do you like animals?
B. You can leave now.

C. Did you take
    your schoolbag?
C. Do you know
   how to do it?
C. We have
    roses.
C. Do you like roses?
C. I have done my
     work.

D. What are you
    doing now?
D. Are you on
   duty today?
D. Can you see
     them?
D. I like flowers, too.
D. I have no time.

填空题

下列关于曲线

=1(m＜6)与曲线

=1（5＜m＜9）几何性质的叙述，正确的有______．（填上你认为正确的序号）①焦距相等 ②离心率相等 ③焦点相同 ④准线相同．