123456789²-123456788×123456790=?(用平方差公式)
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123456789²-123456788×123456790=?(用平方差公式)
123456789²-123456788×123456790=?(用平方差公式)
123456789²-123456788×123456790=?(用平方差公式)
123456789²-123456788×123456790
=123456789²-(123456789-1)×(123456789+1)
=123456789²-(123456789²-1²)
=123456789²-123456789²+1²
=1