Ответ:
1. 3а²-(3а-1)(а+5)=3а²-(3а²+15а-а-5)=3а²-(3а²+14а-5)=3а²-3а²-14а+5=-14а+5
а=3
-14×3+5=-37
2. (2а+4)(3а-1)-(6а+2)(а-5)=6а²-2а+12а-4-(6а²-30а+2а-10)=6а²+10а-4-(6а²-28а-10)=6а²+10а-4-6а²+28а+10=38а+6
а=1
38×1+6=44
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Answers & Comments
Ответ:
1. 3а²-(3а-1)(а+5)=3а²-(3а²+15а-а-5)=3а²-(3а²+14а-5)=3а²-3а²-14а+5=-14а+5
а=3
-14×3+5=-37
2. (2а+4)(3а-1)-(6а+2)(а-5)=6а²-2а+12а-4-(6а²-30а+2а-10)=6а²+10а-4-(6а²-28а-10)=6а²+10а-4-6а²+28а+10=38а+6
а=1
38×1+6=44