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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; .](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+. "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; .")
30% от 60 = 18
18-7,2=10,8
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Спасибо огромное
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