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脱式计算能简便的要简便二点5×4点四怎么简便

2.5×4.4 =2.5×4×1.1 =10×1.1 =11

4.3×1.2×4 =4.3×4.8 =4.3×5-4.3×0.2 =21.5-0.86 =21.5-1+0.14 =20.64

2.5x4.4x0.7 =2.5x4x1.1x0.7 =10x0.77 =7.7 希望能帮到你

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5.2-7.2×0.45 =5.2-3.24 =1.96

2.9-0.1+6.5×2 =2.9-0.1+13 =2.8+13 =15.8

0.88×3.5-0.44×3 =0.44×2×3.5-0.44×3 =0.44×(2×3.5-3) =0.44×4 =1.56

54×58加四点2×540怎么简便计算 54×58加四点2×540 =54*(58+42) =54*100 =5400

3.65×4点7-36点5×0点四七 =3.65×*4.7-3.65*4.7 =3.65*(4.7-4.7) =3.65*0 =0

4.28-1.75+2.72-3.25 =(4.28+2.75)-(1.75+3.25) =7-5 =2

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