51分1×（32分9×56）用简便计算

1/51x(9/32x56)
=1/51x63/4
=1/51x(51/4+12/4)
=1/51x(51/4+3)
=1/51x51/4+3x1/51
=1/4+1/17
=(4+17)/(4x17)
=21/68

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