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55乘九点九用脱式怎么算

9.9*9.9 =(10-0.1)*9.9 =10*9.9-0.1*9.9 =99-0.99 =98.01

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

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

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”。

9.9×4.6=45.54

5.6x9.9 =5.6x(10-0.1) =5.6x10-5.6x0.1 =56-0.56 =55.44

8.5乘9.9脱式计算怎么算的 解答: 8.5x9.9 =8.5x(10-0.1) =8.5x10-8.5x0.1 =85-0.85 =84.15

150×99 =150×(100-1) =150×100-150 =15000-150 =14850

2.9-2.9x0.9 =2.9x(1-0.9) =2.9x0.1 =0.29 朋友,请及时采纳正确答案,下次还可能帮到您哦,您采纳正确答案,您也可以得到财富值,谢谢。

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