1)Г
2)В
3)А
6)(а+7)(а-4)-а(а+3)=a^2-4a+7a-28-a^2-3a=28
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Answers & Comments
1)Г
2)В
3)А
6)(а+7)(а-4)-а(а+3)=a^2-4a+7a-28-a^2-3a=28