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Sixth grade simple arithmetic 654321 * 123456-654322 * 123455
654321×123456-654322×123455
=654321×（1+123455）-（654321+1）×123455
=654321×1+654321×123455-654321×123455-1×123455
=（654321×123455-654321×123455）+（654321×1-1×123455）
=0+530866
=530866
123456+654321-123456+654321
252735232
What is 123456 + 654321
111111111
12345×123456=?123456×1234567=?
1524064320
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