巧算: 99*99+199 = = =
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巧算: 99*99+199 = = =
巧算: 99*99+199 = = =
巧算: 99*99+199 = = =
99×99+199
=99×99+100+99
=99×(99+1)+100
=9900+100
=10000
原式 =(100-1)²+(200-1) =100²-200+1+200-1 =100² =10000 ~一刻永远523为你解答,祝你学习进步~~~ ~如果你认可我的回答,请及时点击【采纳为满意回答】按钮~ ~手机提问者在客户端上评价点“满意”即可~~ ~你的采纳是我前进的动力~~~ ~如还有新的问题,请另外向我求助,答题不易,敬请谅解~~