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55乘九点九用脱式怎么算

55×9.9 =55×(10-0.1) =55×10-55×0.1 =550-5.5 =544.5

0.85 × 9.9 = 0.85 × (10 - 0.1) = 8.5 - 0.085 = 8.415

0.82×9.9 =0.82×(10-0.1) =0.82×10-0.82×0.1 =8.2-0.082 =8.118

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

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

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”。

解:依据题意有, 6.9*9.9 =(7-0.1)(10-0.1) =70-0.7-1+0.01 =68+2-1.7+0.01 =68+0.3+0.01 =68.31

9.9×8×9.9 =79.2×9.9 =784.08

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

18-7-9 =11-9 =2

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