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328 - 99Óüò±ã¼ÆËã
328 -99 = 328 -100 +1 = 228 +1 = 229
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=(328-1)+100 =228+100 =328
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328¡Á99 =328¡Á9£¨100-1£©=328¡Á100-328 =32800-328 =32472
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=328x(100-1)=328x100-328x1 =3280-328 =2952
328*99 328ÔõÑù¼ò±ã¼ÆËã
328x99+328 =328x(99+1)=328x100 =32800