2×345+987×678

To solve the expression \(2 \times 345 + 987 \times 678\), let's calculate each part step-by-step:

1. Calculate \(2 \times 345\): \[ 2 \times 345 = 690 \]

2. Calculate \(987 \times 678\): \[ 987 \times 678 = 668,346 \]

3. Now, add the two results together: \[ 690 + 668,346 = 669,036 \]

Thus, \(2 \times 345 + 987 \times 678 = 669,036\).