@ @RU@ @óïbÿa@‡ÉÜa@ú†bjà@ @ [Aust.MC 1979] ( ) . 128 () .127 . [Aust.MC 1979] ( ) 852 . 10 .9 91 . 90 × 2 = 180 99 . 852 − 180 − 9 = 663 100 . 663 ÷ 3 = 221 100 . 9 + 180 + 221 = 320 [Math counts 1985] ( ) . .2 × 2 × 2 × 2 × 2 = 32