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3000÷8÷25=

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=3600除以(8乘25)=3600除以200 =18

3000÷(3×8) =3000÷24 =125

2800÷8÷25÷5 =2800÷(25×5×8) =2800÷(125×8) =2800÷1000 =2.8

2800÷25÷8,简便计算 2800÷25÷8 =2800÷(25x8) =2800÷200 =14

1000÷8+2000÷8+3000÷8+…+9000÷8 =125+125x2+125x3+......+125x9 =125x(1+2+3+...+9) =125x(1+9)x9÷2 =125x45 =125x40+125x5 =5000+625 =5625

答案是 : 12

3000÷625÷8+0.4×2.5 =3×1000÷25÷25÷8+0.4×2.5 =3×40÷5÷5÷8+0.4×2.5 =3/5+0.4×2.5 =1.6

25x160÷8÷125 = 25×4×40÷(8×125) =100×40÷1000 =4000÷1000 =4

0.312

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