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(???????????success\great\excellent?????????????????????????)

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1????????????

2????????????

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??????(?????)c1→c5

b1???c5→b10

??c1→c5

????????????4???????????????????7???

???????400×4=1600?????????400×7=2800???;

??b1???????

??????c5??????3200????????????????b3,?????b5?????????????????4800????????6000???

????????????????????????????4???????7??;???????4800??????6000

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??????(?????)b1???c1→b10

??b1???????

b1+8??C???=?????????????Ч??(???b3?????b5)

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8??C??400×8=3200???

????????????????????????8??;???3200

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