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- 4( )6.Tom _____bread in his bag.
- 5100*95-95*90+90*85-85*80+80*75-75+70+…+20*15-15+10+10*5
- 6设随机变量(X,Y)服从G={(x,y)|0
- 7已知等腰三角形ABC中,一腰AC上的中线BD将三角形的周长分成9cm和15cm两部分,求这个三角形的腰长和底边的长.
- 8I went to bed after 10 o'clock last night.改为同义句
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