0.004×400000×0.04-¹/7

To solve the expression \(0.004 \times 400000 \times 0.04 - \frac{1}{7}\), we can follow these steps:

1. Calculate \(0.004 \times 400000\): \[ 0.004 \times 400000 = 1600 \]

2. Next, calculate \(1600 \times 0.04\): \[ 1600 \times 0.04 = 64 \]

3. Now, subtract \(\frac{1}{7}\) from 64: \[ 64 - \frac{1}{7} \]

To perform the subtraction, we can convert 64 to a fraction: \[ 64 = \frac{448}{7} \]

Now we have: \[ \frac{448}{7} - \frac{1}{7} = \frac{448 - 1}{7} = \frac{447}{7} \]

Thus, the final result is: \[ \frac{447}{7} \]

If you prefer a decimal approximation, \(\frac{447}{7} \approx 63.8571\).