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- 2说出下列多项式是由哪几项组成的,它们分别是多少次多项式?(1)3x-2y+1(2)2a²-3a+5
- 30.1moIL-1氨水中,c(OH-)=C(NH4+)对么
- 4某小学男,女人数之比是21:16,后来又转来几名女生,这是男,女生人数之比为6:5,全校现有770名学生,转来多少
- 5用一根绳子测井深,把绳子折三折去量,井外余3尺,把绳子折四折去量,就距井口1尺.求井深和绳长?
- 6已知三角形ABC中,角C=90,S三角形ABC=S,一个锐角为a,则三角形外接圆的面积等于?
- 7谁能讲讲反疑疑问句?比如Don't you...然后回答Yes,I do 或者No,I don't 回答的意思是什么?
- 8英选____have you___the broken cup?I have thrown it wayA how do with B how done C what done withD
- 9形容遇到困难不放弃的成语或词语
- 10"what did you hear last night?""I seemes____someone knock at the door".