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3又7分之1×22分之21×(3又7分之1-7又3分之1)×(-22分之7) =7分之22×22分之21×(7分之22-3分之22)×(-22分之7) =3×(3分之22-7分之22)×22分之7 =3×3分之22x22分之7-3×7分之22x22分之7 =7-3 =4
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