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2,5 * 3,5 - 0,35 = 2,5 * 0,35 * 10 - 0,35 = 25 * 0,35 - 0,35 = 0,35(25 - 1) == 0,35 * 24 = 8,4
![sqrt{75*90*8} = sqrt{25*3*9*10*4*2} =5*3*2* sqrt{3*10*2} = sqrt{75*90*8} = sqrt{25*3*9*10*4*2} =5*3*2* sqrt{3*10*2} =](https://tex.z-dn.net/?f=+sqrt%7B75%2A90%2A8%7D+%3D+sqrt%7B25%2A3%2A9%2A10%2A4%2A2%7D+%3D5%2A3%2A2%2A+sqrt%7B3%2A10%2A2%7D+%3D)
![=30* sqrt{3*5*2*2}=30*2 sqrt{15}=60 sqrt{15} =30* sqrt{3*5*2*2}=30*2 sqrt{15}=60 sqrt{15}](https://tex.z-dn.net/?f=%3D30%2A+sqrt%7B3%2A5%2A2%2A2%7D%3D30%2A2+sqrt%7B15%7D%3D60+sqrt%7B15%7D+++)
![frac{( a^{-4}) ^{-3} }{ a^{-6} }= frac{ a^{(-4)*(-3)} }{ a^{-6} } = frac{ a^{12} }{ a^{-6} }= a^{12-(-6)}= a^{12+6} = a^{18} frac{( a^{-4}) ^{-3} }{ a^{-6} }= frac{ a^{(-4)*(-3)} }{ a^{-6} } = frac{ a^{12} }{ a^{-6} }= a^{12-(-6)}= a^{12+6} = a^{18}](https://tex.z-dn.net/?f=+frac%7B%28+a%5E%7B-4%7D%29+%5E%7B-3%7D++%7D%7B+a%5E%7B-6%7D+%7D%3D++frac%7B+a%5E%7B%28-4%29%2A%28-3%29%7D+%7D%7B+a%5E%7B-6%7D+%7D+%3D+frac%7B+a%5E%7B12%7D+%7D%7B+a%5E%7B-6%7D+%7D%3D+a%5E%7B12-%28-6%29%7D%3D+a%5E%7B12%2B6%7D+%3D+a%5E%7B18%7D+++)
![x^{2} +3x=4\\ x^{2} +3x-4=0\\D= 3^{2}-4*1*(-4)=9+16=25= 5^{2}\\ x_{1}= frac{-3+5}{2} =1\\ x_{2} = frac{-3-5}{2}=-4 x^{2} +3x=4\\ x^{2} +3x-4=0\\D= 3^{2}-4*1*(-4)=9+16=25= 5^{2}\\ x_{1}= frac{-3+5}{2} =1\\ x_{2} = frac{-3-5}{2}=-4](https://tex.z-dn.net/?f=+x%5E%7B2%7D+%2B3x%3D4%5C%5C+x%5E%7B2%7D+%2B3x-4%3D0%5C%5CD%3D+3%5E%7B2%7D-4%2A1%2A%28-4%29%3D9%2B16%3D25%3D+5%5E%7B2%7D%5C%5C+x_%7B1%7D%3D+frac%7B-3%2B5%7D%7B2%7D+%3D1%5C%5C+x_%7B2%7D+%3D+frac%7B-3-5%7D%7B2%7D%3D-4++++)
![a(a+1)-(a-3) ^{2}= a^{2} +a-( a^{2} -6a+9)= a^{2}+a- a^{2}+6a-9= a(a+1)-(a-3) ^{2}= a^{2} +a-( a^{2} -6a+9)= a^{2}+a- a^{2}+6a-9=](https://tex.z-dn.net/?f=a%28a%2B1%29-%28a-3%29+%5E%7B2%7D%3D+a%5E%7B2%7D+%2Ba-%28+a%5E%7B2%7D+-6a%2B9%29%3D+a%5E%7B2%7D%2Ba-+a%5E%7B2%7D%2B6a-9%3D+++)
![7a-9\\a=-1\\7*(-1)-9=-7-9=-16 7a-9\\a=-1\\7*(-1)-9=-7-9=-16](https://tex.z-dn.net/?f=7a-9%5C%5Ca%3D-1%5C%5C7%2A%28-1%29-9%3D-7-9%3D-16)
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