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945= 1/2 x 9 x 15 x t
945= 4,5 x 15 = 67,5
t= 945:67,5= 13dm
945 = 1/2 x 9 x 15 x t
945 = 4.5 x 15 = 67.5
t = 945 : 67.5 = 13 dm