123456789的2次方-123456788x123456790

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123456789的2次方-123456788x123456790

123456789的2次方-123456788x123456790
123456789的2次方-123456788x123456790

123456789的2次方-123456788x123456790
=123456789*123456789-123456788x123456790
=123456789*123456788+123456789-123456788x123456790
=(123456789-123456790)*123456788+123456789
=123456789-123456788
=1