(123456789/123456788-123456788/123456789)除以(1/123456788+1/123456789)

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(123456789/123456788-123456788/123456789)除以(1/123456788+1/123456789)

(123456789/123456788-123456788/123456789)除以(1/123456788+1/123456789)
=(1+1/123456788-(1-1/123456789))除以(1/123456788+1/123456789)
=(1+1/123456788-1+1/123456789))除以(1/123456788+1/123456789)
=(1/123456788+1/123456789))除以(1/123456788+1/123456789)
=1

计算器(123456789/123456788-123456788/123456789)/(1/123456788+1/123456789) = 1.0000000079113