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a + b = 2/3
menggunakan metode eliminasi dengan ditambahkan
2a + 0 = 1
a = 1/2 atau 3/6
a + b = 2/3
3/6 + b = 4/6
b = 1/6
ab = 1/2 × 1/6 = 1/12
16). 20 - ( 5 1/2 + 6 2/3 )
= 20 -( 11/2 + 20/3 )
= 120/6 - ( 33/6 + 40/6 )
= 120/6 - 73/6
= 47/6
= 7 5/6
( maaf jika salah )