Помогите, дам 50 баллов!
4)(а²+36)²-144а²
5)4m²-20mn+25n²-36
2)
[tex]\frac{ {53}^{2} - {45}^{2} }{ {47}^{2} - 44 \times 47 + {22}^{2} } [/tex]

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