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怎样简便计算49x99+99

49*99+99*1=99*(49+1) =99*50 =4950;

99+49x99 =99x(1+49) =(100-1)x50 =100x50-50 =5000-50 =4950

49×99+49 =49×(99+1) =49×100 =4900 你好,本题已解答,如果满意 请点右上角“采纳答案”。

49x99+49=(99十1)x49

100x100-99x99+98x98-97x97+。。。+4x4-x4-3x3+2x2-1 =(100+99)(100-99)+(98+97)(98-97)+......+(4+3)(4-3)+(2+1)(2-1) =199+195+......7+3 =(199+3)+(195+7)+(191+11)+(187+15)+......+(103+99) =5050

99+49×99 =99×(1+49) =99×50 =(100-1)×50 =100×50-50 =5000-50 =4950

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