987654321*123456789-987654320*123456788的简便计算大神们帮帮忙

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987654321*123456789-987654320*123456788的简便计算大神们帮帮忙

987654321*123456789-987654320*123456788 =987654321*（123456788+1）-987654320*123456788 =987654321*123456788+987654321-987654320*123456788 =（987654320+1-987654320）*123456788+987654321 =123456788+987654321 =1111111109

123456789+987654321-987654321= 987654321/123456789 123456789+987654321*123456789/987654321= 123456789+123456789+123456789+987654321+987654321是多少 123456789+123456789-987654321等于多少? 123456789+987654321等于多少 987654321×123456789等于多少? 123456789*987654321=多少 123456789乘987654321等于 987654321-123456789=多少 123456789-987654321= 123456789+987654321等于? 123456789×987654321等于几 123456789+987654321=? 123456789+987654321等于几? 123456789*除以987654321* 123456789加上987654321? 请问987654321+123456789＝