Example

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

Question

$$\frac{ { 0.4 }^{ 2 } -1.6 \times 0.8+ { 1.6 }^{ 2 } }{ { 1.6 }^{ 2 } - { 0.4 }^{ 2 } }$$

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