654322*123456-123455*654321简算?
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设a=123456,b=654321,则原式变为(b+1)a-(a-1)b=ab+a-ab+b=a+b=777777。
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654322×123456-123455×654321=(654321+1)×123456-123455×654321=654321×123456+123456-123455×654321=654321×(123456-123455)+123456=654321×1+123456=654321+123456=777777
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654322×123456-123455×654321
=(654321+1)×123456-123455×654321
=654321×123456+123456-123455×654321
=654321×(123456-123455)+123456
=654321×1+123456
=654321+123456
=777777
=(654321+1)×123456-123455×654321
=654321×123456+123456-123455×654321
=654321×(123456-123455)+123456
=654321×1+123456
=654321+123456
=777777
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654322×123456-123455×654321
=(654321+1)×123456-123455×654321
=654321×123456+123456-123455×654321
=654321×(123456-123455)+123456
=654321×1+123456
=654321+123456
=777777
=(654321+1)×123456-123455×654321
=654321×123456+123456-123455×654321
=654321×(123456-123455)+123456
=654321×1+123456
=654321+123456
=777777
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654322×123456-123455×654321
=(654321+1)×123456-123455×654321
=654321×123456+123456-123455×654321
=654321×(123456-123455)+123456
=654321×1+123456
=654321+123456
=777777
=(654321+1)×123456-123455×654321
=654321×123456+123456-123455×654321
=654321×(123456-123455)+123456
=654321×1+123456
=654321+123456
=777777
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