Tolong dibantu jawab y,dan sertai carqny jg

1 ha = 1 hm²
1 are = 1 dam²
2 ½ km² = 2 ½ × 100 = 250 ha
750 dam² = 750 : 100 = 7.5 ha
250 are = 250 : 100 = 2.5 ha
250 + 7.5 - 2.5 = 257.5 - 2.5 = 255 ha