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16/9 : 8/3 - 2/5 : 8/5 =
16/9 * 3/8 - 2/5 * 5/8 =
2/3 * 1/1 - 1/1 * 1/4 =
2/3 - 1/4 =
8/12 - 3/12 = 5/12
2 1/2 * (4/5 - 1/2)² =
5/2 * ( 8/10 - 5/10)² =
5/2 * (3/10)² =
5/2 * 9/100 =
45/200 = 9/40
4 3/5 - (1/2)³ * 8/9= [ (1/2)³=1/2*1/2*1/2=1/8]
4 3/5 - 1/8 * 8/9 =
4 3/5 - 1/1 * 1/9 =
4 3/5 - 1/9 =
4 27/45 - 5 /45 = 4 22/45