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8)
![displaystyle x^2(x+1)-(x+2)(2x-3)=x^2(x-1)\\x^2(x+1)-x^2(x-1)-(x+2)(2x-3)=0\\x^2(x+1-x+1)-(2x^2-3x+4x-6)=0\\2x^2-2x^2-x+6=0\\-x+6=0\\-x=-6\\x=6 displaystyle x^2(x+1)-(x+2)(2x-3)=x^2(x-1)\\x^2(x+1)-x^2(x-1)-(x+2)(2x-3)=0\\x^2(x+1-x+1)-(2x^2-3x+4x-6)=0\\2x^2-2x^2-x+6=0\\-x+6=0\\-x=-6\\x=6](https://tex.z-dn.net/?f=displaystyle+x%5E2%28x%2B1%29-%28x%2B2%29%282x-3%29%3Dx%5E2%28x-1%29%5C%5Cx%5E2%28x%2B1%29-x%5E2%28x-1%29-%28x%2B2%29%282x-3%29%3D0%5C%5Cx%5E2%28x%2B1-x%2B1%29-%282x%5E2-3x%2B4x-6%29%3D0%5C%5C2x%5E2-2x%5E2-x%2B6%3D0%5C%5C-x%2B6%3D0%5C%5C-x%3D-6%5C%5Cx%3D6)
10)
![displaystyle A=a^2-3a+2; B=2a^2+3a-1 displaystyle A=a^2-3a+2; B=2a^2+3a-1](https://tex.z-dn.net/?f=displaystyle+A%3Da%5E2-3a%2B2%3B+B%3D2a%5E2%2B3a-1)
![displaystyle B-A\\(2a^2+3a-1)-(a^2-3a+2)=2a^2+3a-1-a^2+3a-2=\\=a^2+6a-3 displaystyle B-A\\(2a^2+3a-1)-(a^2-3a+2)=2a^2+3a-1-a^2+3a-2=\\=a^2+6a-3](https://tex.z-dn.net/?f=displaystyle+B-A%5C%5C%282a%5E2%2B3a-1%29-%28a%5E2-3a%2B2%29%3D2a%5E2%2B3a-1-a%5E2%2B3a-2%3D%5C%5C%3Da%5E2%2B6a-3)
![displaystyle -A-B\\-(a^2-3a+2)-(2a^2+3a-1)=-a^2+3a-2-2a^2-3a+1=\\=-3a^2-1 displaystyle -A-B\\-(a^2-3a+2)-(2a^2+3a-1)=-a^2+3a-2-2a^2-3a+1=\\=-3a^2-1](https://tex.z-dn.net/?f=displaystyle+-A-B%5C%5C-%28a%5E2-3a%2B2%29-%282a%5E2%2B3a-1%29%3D-a%5E2%2B3a-2-2a%5E2-3a%2B1%3D%5C%5C%3D-3a%5E2-1)
![displaystyle A*(-B)\\(a^2-3a+2)*(-2a^2-3a+1)=\\=-2a^4+6a^3-4a^2-3a^3+9a^2-6a+a^2-3a+2=\\=-2a^4+3a^3+6a^2-9a+2 displaystyle A*(-B)\\(a^2-3a+2)*(-2a^2-3a+1)=\\=-2a^4+6a^3-4a^2-3a^3+9a^2-6a+a^2-3a+2=\\=-2a^4+3a^3+6a^2-9a+2](https://tex.z-dn.net/?f=displaystyle+A%2A%28-B%29%5C%5C%28a%5E2-3a%2B2%29%2A%28-2a%5E2-3a%2B1%29%3D%5C%5C%3D-2a%5E4%2B6a%5E3-4a%5E2-3a%5E3%2B9a%5E2-6a%2Ba%5E2-3a%2B2%3D%5C%5C%3D-2a%5E4%2B3a%5E3%2B6a%5E2-9a%2B2)
10)
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Спасибо вам большое! Вы меня очень выручили!!! :)
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