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????20?????1000(10*10*10)??????????

????? 2?????1???????90(10*9)???????9/100??

????? 3???????10???????1/100??

????? 3???????900???????1/10??

?????40?????343(7*7*7)??????????

????? 2?????1???????42(7*6)???????6/49??

????? 3???????7???????1/49??

????? 3???????294???????1/7??

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???9/100*550+1/100*5000+1/10*150=49.5+50+15=114.5

????6/49*550+1/49*5000+1/7*150≈67.3+112+21.4≈201

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???2?????1????????550????;

3????????5000????;

3????????150???顣

?????40??ο????????20???

?20:114.5*2=229

?40: 201

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