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ï¼2ï¼7æï¼545 - 430 = 115 8æï¼640 - 545 = 95 9æï¼730 - 640 = 90
10æï¼825 - 730 = 95 11æï¼920 - 825 = 95 12æï¼998 - 920 = 78
ï¼3ï¼æ»ç¨çµéï¼115 + 95 + 90 + 95 + 95 + 78 = 568
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