[七年级下册人教版数学书108页1]1、解下列方程组 (1)3x-y=5……○1 5y-1=3x+5……○2 解：对○1式变形得 3x=y+5……○3 将○3式带入○1式得：5y-1=y+5+5……○4 将○4式变形得： 4y=11 所以：y=11/4 将y=11/4带入...+阅读
Eric: Hi, David. How are you? Are you OK?
David: No, I'm not.
Eric: What's wrong?
David: It's Tuesday.
Eric: So?
David: I have two math classes on Tuesday.
Eric: You don't like math?
David: No. It's so difficult! My father says it's interesting. But I don't think so.
Eric: So what's your favorite subject?
David: Chinese. It's difficult but interesting!
Eric: When is your Chinese class?
David: It's on Monday, Wednesday, Thursday and Friday. I have to go now! I have math, history and science this morning.
Eric: OK, see you at music class.
David: Bye!
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