72分之7÷5分之4×63分之8
=7/72÷4/5×8/63
=7/72×5/4×8/63
=（7/63）×（8/72）×5/4
=1/9×1/9×5/4
=1/81×5/4
=5/324
=324分之5
7/72÷4/5x8/63
=7/72x5/4x8/63
=7/72x8/63x5/4
=1/9ⅹ1/9x5/4
=5/324。
7/72÷4/5×8/63
=7/72×8/63×5/4
=1/81×5/4
=5/324
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