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2. 3/20 - 3/5 - 1/4 = 3/20 + 12/20 - 5/20 = 15/20 - 5/20 = 10/20 = 1/2
3. 0,8 - 0,25 = 0,55
4.gelas = 2 ¹/₂ lusin = 30 buah
sendok = ¹/₂ lusin = 6 buah
jumlahnya = 30 + 6 = 36 buah
semoga membantu...