17/32×31
=17/32×(32-1)
=17/32×32-17/32×1
=17-17/32
=16又15/32
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17 / 32 × 31
= 17 / 32 × (32 - 1)
= 17 / 32 × 32 - 17 / 32 × 1
= 17 - 17 / 32
= 16 + 32 / 32 - 17 / 32
= 16 + 15 / 32
= 512 / 32 + 15 / 32
= 527 / 32
将31换为(32-1)
17/32*(32-1)