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答:12.5×32×0.25
=12.5×32×1/4
=12.5×8
=100
(24/19+16/17)×1/8+15/17
=3/19+2/17+15/17
=3/19+1
=22/19
432×99-568
=432×(100-1)-568
=43200-432-568
=43200-(432+568)
=43200-1000
=42200
=12.5×32×1/4
=12.5×8
=100
(24/19+16/17)×1/8+15/17
=3/19+2/17+15/17
=3/19+1
=22/19
432×99-568
=432×(100-1)-568
=43200-432-568
=43200-(432+568)
=43200-1000
=42200
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