Question

(123456789的平方-1234567890*1234567892)分之123456789 求简算方法和结果

有没有 简单点的求你们了

Answer 1

令123456799=a
则原式=a/[a²-(a+1)(a+3)]
=a/(a²-a²-4a-3)
=-a/(4a+3)
=-123456789/493827159

追问

分子是123456789 不是1234567899

Answer 2

123456789/(123456789^2 -1234567890*1234567892)
=123456789/[123456789^2 -(1234567891-1)*(1234567891+1)]
=123456789/[123456789^2 -(1234567891^2-1)]
=123456789/(123456789^2 -1234567891^2+1)
=123456789/[123456789^2 -(1234567890+1)^2+1]
=123456789/[123456789^2 -(1234567890^2+2*1230567890+1)+1]
=123456789/(123456789^2 -100*123456789^2-20*123056789)
=123456789/( -99*123456789^2-20*123056789)
=-1/( 99*123456789+20)

追问

这 好多数啊 好难.........

追答

=1/[123456789-(1230567890+2)*10]

追问

好吧 谢谢

Answer 3

123456789的平方-1234567890*1234567892 求简算方法和结果