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2. 2.280
3. 5.261
2) 450 x 9 + 6000 : (-20) - 1800 = 4050 - 300 - 1800 = 1950
15)
Luas 1 ( trapesium) = Jumlah sisi sejajar/2 x t = (26+41)/2 x 23 = 770,5
Luas 2 (luas persegi panjang) = p x l = 40 x 26 = 1040
Luas = Luas 1 + Luas 2 = 770,5 + 1040 = 1810,5