342 + 5 × 342 + 684 × 2 - ( 125 × 32 ) ÷ 4
= 342 + 5 × 342 + ( 342 × 2 ) × 2 - ( 125 × 32 ) ÷ 4
= 342 + 5 × 342 + 342 × 2 × 2 - 4000 ÷ 4
= 342 + 5 × 342 + 342 × 2 × 2 - 1000
= 342 + 5 × 342 + 342 × 4 - 1000
= 342 × ( 5 + 4 + 1 ) - 1000
= 342 × 10 - 1000
= 3420 - 1000
= 2420