Question

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Answer 1

Ответ:

Объяснение:

(a-3)²+a(a+9)=a²-6a+9+a²+9a=2a²+3a+9

9b(b-1)-(3b+2)²=9b²-9b-9b²-12b-4=-21b-4

(a+3)(5-a)-(a-1)²=5a-a²+15-3a-a²+2a-1=-2a²+4a+14

(2a+5)²-5(4a+5)=4a²+20a+25-20a-25=4a²=2a²+2a²

(b-4)²-(b-1)(b-2)=b²-8b+16-b²+2b+b-2=-5b+14=14-5b

(5+2y)(y-3)-(5-2y)²=5y-15+2y²-6y-25+20y-4y²=-2y²+19y-40