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85.3+0.125x7.8x8的简便算法

85.3+0.125x7.8x8 = 85.3+0.125x8x7.8 = 85.3+1 x7.8 = 85.3+7.8 = 93.1

8*0.125=1然后就好算了 这个属于常识

86×3/85 = (85 + 1)×3/85 = 3 又 3/85

86X(3/85) =85X(3/85)+3/85 =3+3/85 =3又85分之3

3.27×8.5+67.3×0.85 =3.27×8.5+6.73×8.5 =(3.27+6.73)×8.5 =10×8.5 =85

6.43-2.85+3.7 =6.43-2.43-0.42+3.7 =7.7-0.42 =7.28

(1)12.25-3.1+0.85-6.17,=(12.25+0.85)-3.1-6.17,=13.1-3.1-6.17,=3.83;(2)2.65×1.7+1.35×1.7,=(2.65+1.35)×1.7,=4×1.7,=6.8;(3)3.6÷(1.2+0.5)×5,=3.6÷1.7×5,= 36 17 ×5,= 10 10 17 ; (4)0.125×0.38×80,=(0.125×80...

85x125-85x24-85 =85×(125-24-1) =85×(125-25) =85×100 =8500

85*3/86 =(86-1)*3/86 =86*3/86-1*3/86 =2又3/86

3.85x25x4 =3.85×(25×4) =3.85×100 =385

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