계산 1 × 4 + 4 × 7 + 7 x 10 +... + 19 × 22 + 22 × 25

계산 1 × 4 + 4 × 7 + 7 x 10 +... + 19 × 22 + 22 × 25

= 4 * 8 + 10 * 20 + 16 * 32 + 22 * 44 = 1712