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⇒12/20 - 15/20 : -1/3
⇒3/20 : -1/3
⇒3/20 x 3/1
⇒9/20
= 3/5 - -6/4 x 2/3 = 3/5 - -12/12 = 3/5 + 12/12
= 36/60 + 60/60
= 96/60 = 8/5
2. (8⁻²)¹/³ + 2⁻² = 1/(8²)¹/³ + 1/2² = 1/(64)¹/³ + 1/4
*Karena 64 sama dengan 4³ maka*
1/(4³)¹/³ + 1/4 = 1/4 + 1/4 = 2/4 = 1/2