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5) 12% от 60 = 0,12*60=7,2
30% от 60 = 18
18-7,2=10,8
![6); ; a- frac{3}{a}=5\\(a-frac{3}{a})^2=a^2-6+frac{9}{a^2}=25\\a+frac{9}{a^2}=25+6=31\\7); ; |x-3|+2cdot |x+1|=4\\x-3=0; ,; ; x=3\\x+1=0; ,; ; x=-1\\a); ; x leq -1; ,; ; |x-3|+2cdot |x+1|=-(x-3)-2cdot (x+1); ,\\ -x+3-2x-2=4\\-3x=3; ,; ; underline {x=-1}\\b); ; -1 textless x leq 3
; ,; ; |x-3|+2|x+1|=-(x-3)+2(x+1); ,\\-x+3+2x+2=4\\x=-1notin (-1,3, ]\\c); ; x textgreater 3; ,; ; |x-3|+2|x+1|=x-3+2(x+1); ,\\x-3+2x+2=4\\3x=5\\x=1frac{2}{3} notin (3,+infty )\\Otvet:; ; x=-1; . 6); ; a- frac{3}{a}=5\\(a-frac{3}{a})^2=a^2-6+frac{9}{a^2}=25\\a+frac{9}{a^2}=25+6=31\\7); ; |x-3|+2cdot |x+1|=4\\x-3=0; ,; ; x=3\\x+1=0; ,; ; x=-1\\a); ; x leq -1; ,; ; |x-3|+2cdot |x+1|=-(x-3)-2cdot (x+1); ,\\ -x+3-2x-2=4\\-3x=3; ,; ; underline {x=-1}\\b); ; -1 textless x leq 3
; ,; ; |x-3|+2|x+1|=-(x-3)+2(x+1); ,\\-x+3+2x+2=4\\x=-1notin (-1,3, ]\\c); ; x textgreater 3; ,; ; |x-3|+2|x+1|=x-3+2(x+1); ,\\x-3+2x+2=4\\3x=5\\x=1frac{2}{3} notin (3,+infty )\\Otvet:; ; x=-1; .](https://tex.z-dn.net/?f=6%29%3B+%3B+a-+frac%7B3%7D%7Ba%7D%3D5%5C%5C%28a-frac%7B3%7D%7Ba%7D%29%5E2%3Da%5E2-6%2Bfrac%7B9%7D%7Ba%5E2%7D%3D25%5C%5Ca%2Bfrac%7B9%7D%7Ba%5E2%7D%3D25%2B6%3D31%5C%5C7%29%3B+%3B+%7Cx-3%7C%2B2cdot+%7Cx%2B1%7C%3D4%5C%5Cx-3%3D0%3B+%2C%3B+%3B+x%3D3%5C%5Cx%2B1%3D0%3B+%2C%3B+%3B+x%3D-1%5C%5Ca%29%3B+%3B+x+leq+-1%3B+%2C%3B+%3B+%7Cx-3%7C%2B2cdot+%7Cx%2B1%7C%3D-%28x-3%29-2cdot+%28x%2B1%29%3B+%2C%5C%5C+-x%2B3-2x-2%3D4%5C%5C-3x%3D3%3B+%2C%3B+%3B+underline+%7Bx%3D-1%7D%5C%5Cb%29%3B+%3B+-1+textless++x+leq+3%0A%3B+%2C%3B+%3B+%7Cx-3%7C%2B2%7Cx%2B1%7C%3D-%28x-3%29%2B2%28x%2B1%29%3B+%2C%5C%5C-x%2B3%2B2x%2B2%3D4%5C%5Cx%3D-1notin+%28-1%2C3%2C+%5D%5C%5Cc%29%3B+%3B+x+textgreater++3%3B+%2C%3B+%3B+%7Cx-3%7C%2B2%7Cx%2B1%7C%3Dx-3%2B2%28x%2B1%29%3B+%2C%5C%5Cx-3%2B2x%2B2%3D4%5C%5C3x%3D5%5C%5Cx%3D1frac%7B2%7D%7B3%7D+notin+%283%2C%2Binfty+%29%5C%5COtvet%3A%3B+%3B+x%3D-1%3B+.)
![8); ; frac{4x+1}{8}-0,5=frac{3x+8}{12}-frac{x}{6}; |cdot 24\\3(4x+1)-12=2(3x+8)-4x\\12x+3-12=6x+16-4x\\10x=25\\underline {x=2,5}\\9); ; 7x^2-8x+1=7(x- frac{1}{7} )(x-1)=(7x-1)(x-1)\\7x^2-8x+1=0; ,; ; frac{D}{4}=4^2-7=9; ,\\x_1= frac{4-3}{7}=frac{1}{7}; ,; ; x_2=frac{4+3}{7}=1 \\Otvet:; ; A); . 8); ; frac{4x+1}{8}-0,5=frac{3x+8}{12}-frac{x}{6}; |cdot 24\\3(4x+1)-12=2(3x+8)-4x\\12x+3-12=6x+16-4x\\10x=25\\underline {x=2,5}\\9); ; 7x^2-8x+1=7(x- frac{1}{7} )(x-1)=(7x-1)(x-1)\\7x^2-8x+1=0; ,; ; frac{D}{4}=4^2-7=9; ,\\x_1= frac{4-3}{7}=frac{1}{7}; ,; ; x_2=frac{4+3}{7}=1 \\Otvet:; ; A); .](https://tex.z-dn.net/?f=8%29%3B+%3B+frac%7B4x%2B1%7D%7B8%7D-0%2C5%3Dfrac%7B3x%2B8%7D%7B12%7D-frac%7Bx%7D%7B6%7D%3B+%7Ccdot+24%5C%5C3%284x%2B1%29-12%3D2%283x%2B8%29-4x%5C%5C12x%2B3-12%3D6x%2B16-4x%5C%5C10x%3D25%5C%5Cunderline+%7Bx%3D2%2C5%7D%5C%5C9%29%3B+%3B+7x%5E2-8x%2B1%3D7%28x-+frac%7B1%7D%7B7%7D+%29%28x-1%29%3D%287x-1%29%28x-1%29%5C%5C7x%5E2-8x%2B1%3D0%3B+%2C%3B+%3B+frac%7BD%7D%7B4%7D%3D4%5E2-7%3D9%3B+%2C%5C%5Cx_1%3D+frac%7B4-3%7D%7B7%7D%3Dfrac%7B1%7D%7B7%7D%3B+%2C%3B+%3B+x_2%3Dfrac%7B4%2B3%7D%7B7%7D%3D1+%5C%5COtvet%3A%3B+%3B+A%29%3B+.)
30% от 60 = 18
18-7,2=10,8
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