Question

Difficulty: MediumAbsolute Value

Evaluate the following mathematical expression and determine the final integer result.

Answer:The value of the expression ∣−15+3∣2−∣−4×2∣\frac{|-15 + 3|}{2} - |-4 \times 2| is 【-2】.

Answer

The final evaluated result is -2.
The correct result is found by first evaluating the expressions inside the absolute value symbols, which act as grouping symbols. The expression ∣−15+3∣|-15 + 3| becomes ∣−12∣|-12|, which evaluates to 1212. The second part, ∣−4×2∣|-4 \times 2|, becomes ∣−8∣|-8|, which evaluates to 88. Substituting these simplified values back into the original expression yields 122−8\frac{12}{2} - 8. Following the order of operations, division is performed first, giving 66. Finally, 6−86 - 8 results in −2-2.

Step-by-Step Solution

1
Evaluate the operations inside the first absolute value bars.
∣−15+3∣=∣−12∣|-15 + 3| = |-12|
Order of operations requires treating absolute value bars as grouping symbols, meaning the arithmetic inside must be completed first.
2
Apply the absolute value to the first result.
∣−12∣=12|-12| = 12
The absolute value of a number represents its distance from zero, which is always positive.
3
Evaluate the operations inside the second absolute value bars.
∣−4×2∣=∣−8∣=8|-4 \times 2| = |-8| = 8
Perform the multiplication inside the grouping symbol first, then take the absolute value of the negative product.
4
Substitute the evaluated absolute values back into the expression and solve.
122−8=6−8=−2\frac{12}{2} - 8 = 6 - 8 = -2
Perform division before subtraction according to the standard order of operations (PEMDAS).

Key Concept

Absolute Value and Order of Operations
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