Помогите!! Пожалуйста
1.   [tex](x-2) ^{2} - (x-7)(x+5)[/tex]
2.   [tex]8a+3* (a-1) ^{2} [/tex]
3.   [tex](y+2)(3 y^{2} -6y +12) [/tex]
4.   [tex](c+2a) ^{2} -(c-2a) ^{2} [/tex]
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