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pomysovaira
@pomysovaira
October 2021
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ПОМОГИТЕ ПОЖАЛУЙСТА
!!!!АЛГЕБРА
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hlopushinairina
1.8p(3p+8)(2p-5)=8p·(6p²+16p-15p-40)=8p·(6p²+p-40)=48p³+8p²-320p;
2.(2x-4)(2x+5)+20=4x²-8x+10x-20+20=4x²+2x=2x(2x+1);
3.(x-3)(x+5)-(x²+x)=x²-3x+5x-15-x²-x=x-15;
4)a(a-3)+(a+1)(a+4)=a²-3a+a²+a+4a+4=2a²+2a+4=2(a²+a+2)
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Answers & Comments
2.(2x-4)(2x+5)+20=4x²-8x+10x-20+20=4x²+2x=2x(2x+1);
3.(x-3)(x+5)-(x²+x)=x²-3x+5x-15-x²-x=x-15;
4)a(a-3)+(a+1)(a+4)=a²-3a+a²+a+4a+4=2a²+2a+4=2(a²+a+2)