(2-1)(329+91)=

To solve the expression \((2-1)(329+91)\), we perform the calculations step by step:

1. Calculate \(2 - 1\): \[ 2 - 1 = 1 \]

2. Calculate \(329 + 91\): \[ 329 + 91 = 420 \]

3. Now, multiply the results from the two calculations: \[ 1 \times 420 = 420 \]

Therefore, \((2-1)(329+91) = 420\).