Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac { ( 0.8 ) ^ { 3 } + ( 0.5 ) ^ { 3 } } { ( 0.8 ) ^ { 2 } - ( 0.4 ) + ( 0.5 ) ^ { 2 } } = ?$$

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