987654321×12345-987654322×12344的简便运算是什么QAQ

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987654321×12345-987654322×12344的简便运算是什么QAQ
987654321×12345-987654322×12344的简便运算是什么
QAQ

987654321×12345-987654322×12344的简便运算是什么QAQ
987654321×12345-987654322×12344
=987654321×12345-987654321×12344-12344
=987654321×（12345-12344）-12344
=987654321-12344
=987641977

设987654321=a, 12344=b
987654321×12345-987654322×12344
=a×﹙b+1)-(a+1)b
=ab+a-ab-b
=a-b
=987654321- 12344
=987641976

987654321×12345-987654322×12344 987654321×12345-987654322×12344的简便运算是什么QAQ 987654321+987654321-987654321= 1+12+123+1234+12345+123456+1234567+12345678+123456789+987654321=? A=12345乘9876 B=12346乘9875 请比较A与B的大小 123456789+987654321-987654321= 9876÷9876又9876/9877 9876除以9876又9877分之9876 9876×9876－9875×9877 12345 12345 12345 12345: 12345 987654321/123456789 12345678+987654321 123456789+987654321*123456789/987654321= 9876×9876-9875×9877怎么简算?