8x1000 +4x100 + 7x10 + 1x1 + 7x10 + 1x1 + 7x1/10

Answer 1

Let's break down the expression step by step:

1. Calculate each term:

   • \( 8 \times 1000 = 8000 \)
   • \( 4 \times 100 = 400 \)
   • \( 7 \times 10 = 70 \)
   • \( 1 \times 1 = 1 \)
   • \( 7 \times 10 = 70 \) (this appears again)
   • \( 1 \times 1 = 1 \) (this appears again)
   • \( 7 \times \frac{1}{10} = 0.7 \)

2. Add up all the values: \[ 8000 + 400 + 70 + 1 + 70 + 1 + 0.7 \]

3. Combine the numbers step by step:

   • \( 8000 + 400 = 8400 \)
   • \( 8400 + 70 = 8470 \)
   • \( 8470 + 1 = 8471 \)
   • \( 8471 + 70 = 8541 \)
   • \( 8541 + 1 = 8542 \)
   • \( 8542 + 0.7 = 8542.7 \)

The final result is:

\[ \boxed{8542.7} \]