`70201.002+?=756xx8+9.007`

Options

A. 65143.995
B. (-64143.995)
C. 64143.995
D. 15144

Answer

To solve the equation \( 70201.002 + ? = 756xx8 + 9.007 \), we will follow these steps:

### Step 1: Simplify the right side of the equation
We need to calculate \( 756xx8 + 9.007 \). Since \( xx \) represents unknown digits, we will denote \( 756xx8 \) as \( 75600 + 100x + 10y + 8 \) where \( x \) and \( y \) are the unknown digits.

### Step 2: Rearranging the equation
We can rearrange the equation to isolate the question mark:
\[ ? = 756xx8 + 9.007 - 70201.002 \]

### Step 3: Calculate \( 756xx8 + 9.007 \)
Now we need to express \( 756xx8 + 9.007 \) in a more manageable form. We can write:
\[ 756xx8 = 75600 + 100x + 10y + 8 \]
So,
\[ 756xx8 + 9.007 = (75600 + 100x + 10y + 8) + 9.007 \]
This simplifies to:
\[ 75600 + 100x + 10y + 17.007 \]

### Step 4: Substitute back into the equation
Now we substitute this back into our rearranged equation:
\[ ? = (75600 + 100x + 10y + 17.007) - 70201.002 \]

### Step 5: Perform the subtraction
Now we perform the subtraction:
\[ ? = (75600 + 100x + 10y + 17.007) - 70201.002 \]
Calculating \( 75600 - 70201.002 \):
\[ 75600 - 70201.002 = 5398.998 \]
So,
\[ ? = 5398.998 + 100x + 10y \]

### Step 6: Conclusion
The value of the question mark \( ? \) is:
\[ ? = 5398.998 + 100x + 10y \]