2)2/5*2/5*2/5=8/125
4)2 2/3*2 2/3=8/3*8/3=64/9=7,1
7 1/5*2 1/8+7 1/5*1 5/8=36/5*17/8+36/5*13/8=(17/8+13/8)*36/5=221/64*36/5= 7956/320=24,8625
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2)2/5*2/5*2/5=8/125
4)2 2/3*2 2/3=8/3*8/3=64/9=7,1
7 1/5*2 1/8+7 1/5*1 5/8=36/5*17/8+36/5*13/8=(17/8+13/8)*36/5=221/64*36/5= 7956/320=24,8625