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49x99+49的简便方法

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 =49×(99+1) =49×100 =4900

49.2x99+46.2 =49.2x99+49.2-3 =49.2x100-3 =4920-3 =4917

49+49x99 =49×(1+99) =49x100 =4900

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

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

42×99+49 =42×99+42+7 =42×(99+1)+7 =42×100+7 =4200+7 =4207

49x99 =49x100-49 =4900-49 =4851

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....

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