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1)
![frac{ac^{2}}{a-b} ; a=-2,4;b=3,6;c=-3\ \
frac{(-2,4)*(-3)^{2}}{-2,4-3,6} = frac{(-2,4)*9}{-6} = frac{-21,6}{-6} =3,6 frac{ac^{2}}{a-b} ; a=-2,4;b=3,6;c=-3\ \
frac{(-2,4)*(-3)^{2}}{-2,4-3,6} = frac{(-2,4)*9}{-6} = frac{-21,6}{-6} =3,6](https://tex.z-dn.net/?f=+frac%7Bac%5E%7B2%7D%7D%7Ba-b%7D+%3B+a%3D-2%2C4%3Bb%3D3%2C6%3Bc%3D-3%5C+%5C%0A+frac%7B%28-2%2C4%29%2A%28-3%29%5E%7B2%7D%7D%7B-2%2C4-3%2C6%7D+%3D+frac%7B%28-2%2C4%29%2A9%7D%7B-6%7D+%3D+frac%7B-21%2C6%7D%7B-6%7D+%3D3%2C6)
2)
![-3,1m-(-1+5,9m)+(4-m)=-3,1m+1-5,9m+4-m=\
=-10m+5 -3,1m-(-1+5,9m)+(4-m)=-3,1m+1-5,9m+4-m=\
=-10m+5](https://tex.z-dn.net/?f=-3%2C1m-%28-1%2B5%2C9m%29%2B%284-m%29%3D-3%2C1m%2B1-5%2C9m%2B4-m%3D%5C%0A%3D-10m%2B5)
3)
![2x+5=13x+93\
2x-13x=93-5\
-11x=88\
x=-8 2x+5=13x+93\
2x-13x=93-5\
-11x=88\
x=-8](https://tex.z-dn.net/?f=2x%2B5%3D13x%2B93%5C%0A2x-13x%3D93-5%5C%0A-11x%3D88%5C%0Ax%3D-8)
4)
![frac{9900}{7500} =1,32=132%\ \
frac{9900}{7500} =1,32=132%\ \](https://tex.z-dn.net/?f=+frac%7B9900%7D%7B7500%7D+%3D1%2C32%3D132%25%5C+%5C%0A)
т.е цена больше на 132-100=32%
5)
![3,5/2,5=2,8/8x= frac{2,5}{3,5} = frac{8x}{2,8} \ \
frac{2,5}{3,5}* frac{2,8}{8}=x\ \
frac{7}{28}=x\ \
x= frac{1}{4}
3,5/2,5=2,8/8x= frac{2,5}{3,5} = frac{8x}{2,8} \ \
frac{2,5}{3,5}* frac{2,8}{8}=x\ \
frac{7}{28}=x\ \
x= frac{1}{4}](https://tex.z-dn.net/?f=3%2C5%2F2%2C5%3D2%2C8%2F8x%3D+frac%7B2%2C5%7D%7B3%2C5%7D+%3D+frac%7B8x%7D%7B2%2C8%7D+%5C+%5C%0A+frac%7B2%2C5%7D%7B3%2C5%7D%2A+frac%7B2%2C8%7D%7B8%7D%3Dx%5C+%5C%0A+frac%7B7%7D%7B28%7D%3Dx%5C+%5C%0Ax%3D+frac%7B1%7D%7B4%7D++%0A)
6)
![-6,5-(7,2f-(4,3f+(-f-0,9)))=\
=-6,5-(7,2f-(4,3f-f-0,9))=\
=-6,5-(7,2f-4,3f+f+0,9)=\
=-6,5-7,2f+4,3f-f-0,9=\
=-3,9f-7,4
-6,5-(7,2f-(4,3f+(-f-0,9)))=\
=-6,5-(7,2f-(4,3f-f-0,9))=\
=-6,5-(7,2f-4,3f+f+0,9)=\
=-6,5-7,2f+4,3f-f-0,9=\
=-3,9f-7,4](https://tex.z-dn.net/?f=-6%2C5-%287%2C2f-%284%2C3f%2B%28-f-0%2C9%29%29%29%3D%5C%0A%3D-6%2C5-%287%2C2f-%284%2C3f-f-0%2C9%29%29%3D%5C%0A%3D-6%2C5-%287%2C2f-4%2C3f%2Bf%2B0%2C9%29%3D%5C%0A%3D-6%2C5-7%2C2f%2B4%2C3f-f-0%2C9%3D%5C%0A%3D-3%2C9f-7%2C4%0A)
7)
![frac{5x}{8} - frac{8x}{5}=1,18\ \
frac{25x}{40}- frac{64x}{40} =1,18\ \
frac{-39x}{40}=1,18\ \
x=1,18*(- frac{40}{39} ) \ \
x=- frac{118}{100} * frac{40}{39} \ \
x= frac{4720}{3900} \ \
x= frac{472}{390} \ \
x=1 frac{82}{390} \ \
x=1 frac{41}{195}
frac{5x}{8} - frac{8x}{5}=1,18\ \
frac{25x}{40}- frac{64x}{40} =1,18\ \
frac{-39x}{40}=1,18\ \
x=1,18*(- frac{40}{39} ) \ \
x=- frac{118}{100} * frac{40}{39} \ \
x= frac{4720}{3900} \ \
x= frac{472}{390} \ \
x=1 frac{82}{390} \ \
x=1 frac{41}{195}](https://tex.z-dn.net/?f=+frac%7B5x%7D%7B8%7D+-+frac%7B8x%7D%7B5%7D%3D1%2C18%5C+%5C%0A+frac%7B25x%7D%7B40%7D-+frac%7B64x%7D%7B40%7D+%3D1%2C18%5C+%5C%0A+frac%7B-39x%7D%7B40%7D%3D1%2C18%5C+%5C%0Ax%3D1%2C18%2A%28-+frac%7B40%7D%7B39%7D+%29+%5C+%5C%0Ax%3D-+frac%7B118%7D%7B100%7D+%2A+frac%7B40%7D%7B39%7D+%5C+%5C%0Ax%3D+frac%7B4720%7D%7B3900%7D+%5C+%5C%0Ax%3D+frac%7B472%7D%7B390%7D+%5C+%5C%0Ax%3D1+frac%7B82%7D%7B390%7D+%5C+%5C%0Ax%3D1+frac%7B41%7D%7B195%7D+%0A)
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4)
т.е цена больше на 132-100=32%
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