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怎样简便计算49x99+99

怎样简便计算 49x99+99 =99X(49十1) =99x50 =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”。

用简便方法计算o.o1十o.o2到o.99怎么算 o.o1十o.o2到o.99 =(0.01+0.99)x99÷2 =1x99÷2 =99÷2 =49.5

5X1.03X0.2 =(5x0.2)x1.03 =1x1.03 =1.03 32X1.25 =4x(8x1.25) =4x10 =40 0.45X99 =0.45x(100-1) =0.45x100-0.45 =45-0.45 =44.55 53X10.1 =53x(10+0.1) =53x10+53x0.1 =530+5.3 =535.3 4.2X6.51+3.49X4.2 =4.2x(6.51+3.49) =4.2x10 =42 9.99X1....

如图

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

原式=49×(99+1) =49×100 =4900

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

凑整

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