Questions: 3=9-(-17)-12=21

3=9-(-17)-12=21
Transcript text: (1) $3=9-(-17)-12=21$
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Solution

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Solution Steps

The given text seems to contain a series of mathematical expressions. Let's focus on the first three expressions and evaluate them to check if they are true or false.

  1. Evaluate the expression \(3 = 9 - (-11) - 10 = 21\).
  2. Evaluate the expression \(3 = 9 - (-17) - 12 = 21\).
  3. Evaluate the expression \(-3 - 9 - (-10) - 19 = 15\).
Solution Approach
  1. For each expression, calculate the right-hand side and compare it with the left-hand side to determine if the equation holds true.
  2. Use Python to perform the arithmetic operations and comparisons.
Step 1: Evaluate the First Expression

We start with the expression \(3 = 9 - (-11) - 10\). Simplifying the right-hand side:

\[ 9 - (-11) - 10 = 9 + 11 - 10 = 10 \]

Thus, we have:

\[ 3 \neq 10 \]

This means the first expression is false.

Step 2: Evaluate the Second Expression

Next, we evaluate the expression \(3 = 9 - (-17) - 12\). Simplifying the right-hand side:

\[ 9 - (-17) - 12 = 9 + 17 - 12 = 14 \]

Thus, we have:

\[ 3 \neq 14 \]

This means the second expression is also false.

Step 3: Evaluate the Third Expression

Finally, we evaluate the expression \(-3 = -9 - (-10) - 19\). Simplifying the right-hand side:

\[ -9 - (-10) - 19 = -9 + 10 - 19 = -18 \]

Thus, we have:

\[ -3 \neq -18 \]

This means the third expression is false as well.

Final Answer

All three expressions are false. Therefore, the final answer is:

\[ \boxed{\text{All expressions are false.}} \]

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