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5.8*9.9+0.58 怎么简便

5.8*9.9*0.58 =5.8*5.8*0.99 =(6-0.2)*(6-0.2)*(1-0.01) =(36-2.4+0.04)(1-0.01) =33.64*(1-0.01) =33.64-0.3364 =33.3036

=5.8×9.9+5.8×0.1 =5.8×(9.9+0.1) =5.8×10 =58

5.8x9.9+0.58 =5.8x9.9+5.8x0.1 =5.8x(9.9+0.1) =5.8x10 =58

5.8x9.9 =5.8X(10-0.1) =5.8x10-5.8x0.1 =58-0.58 =57.42

5.8x(10-0.1)=5.8x10-5.8x0.1=58-0.58=57.42

5.8×9.9+5.8 =5.8×(9.9+1) =5.8×10.1 =58.58

24 解析: (8-5+10-9)! =4! =4×3×2×1 =24

5.8X(99十9)的简便方法 =5.8x99+5.8x9 =5.8x100-5.8+5.8x10-5.8 =580+58-5.8x2 =639-11.6 =627.4

3.8×0.64+0.62×6.4 =0.38×6.4+0.62×6.4 =(0.38+0.62)×6.4 =1×6.4 =6.4

7.9乘5.8加0.21乘58 =(7.9+2.1)x5.8 =10x5.8 =58

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