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= 10/30 + 12/30 + 20/30
= 42/30 = 7/5
2) 5/6 + 3/4 + 2/3
= 10/12 + 9/12 + 8/12
= 27/12
3) 7/8 + 3/4 + 2/3
= 21/24 + 18/24 + 16/24
= 45/24
4) 2/9 + 2/3 + 2/4
= 8/36 + 24/36 + 18/36
= 50/36 = 25/18
5) 2/10 + 3/5 + 1/2
= 2/10 + 6/10 + 5/10
= 13/10
*cara : samakan penyebut dahulu dgn cara mencari KPK. pada hasil akhir, jika bisa diperkecil, maka perkecilkan dia ^^
semoga bermanfaat