To calculate \( 1 + (-2) + (-3) \): 1. Start with \( 1 + (-2) \): \[ 1 - 2 = -1 \] 2. Next, add \( -3 \) to the result: \[ -1 + (-3) = -1 - 3 = -4 \] So, \( 1 + (-2) + (-3) = -4 \).

1 + (-2) + (-3)

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To calculate \( 1 + (-2) + (-3) \):

Start with \( 1 + (-2) \): \[ 1 - 2 = -1 \]
Next, add \( -3 \) to the result: \[ -1 + (-3) = -1 - 3 = -4 \]

So, \( 1 + (-2) + (-3) = -4 \).