Example

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

Question

$$\frac{ { 0.2 }^{ 2 } +2 \times 0.2 \times 0.3+ { 0.3 }^{ 2 } }{ 0.5 \times 0.4-0.5 \times 0.8 }$$

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