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55乘九点九用脱式怎么算

5.5×9.8 =5.5×(10-0.2) =5.5×10-5.5×0.2 =55-1.1 =53.9

7.49x9.9 =7.49x(10-0.1) =7.49x10-7.49x0.1 =74.9-0.749 =74.151

9.9x2.5 =(10-0.1)x2.5 =10x2.5-0.1x2.5 =25-0.25 =24.75 , 你好,本题已解答,如果满意 请点右下角“采纳答案”。

2.4×9.9 =2.4×(10-0.1) =2.4×10-2.4×0.1 =24-0.24 =23.76

0.78x(100-2) =78-1.56 =76.44

18-7-9 =11-9 =2

5.28×9.9+0.528 =5.28×(9.9+0.1) =5.28×10 =52.8 你好,本题已解答,如果满意 请点右上角“采纳答案”。

9.2×9.9 =9.2×(10-0.1) =92 -0.92 =91.08

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