100%-3.9кг
130%-хкг
х=3,9*130/100
х=5,07кг
Ответ:5,07кг
В первом действительно опечатка. Дробь уж очень смешная..))
![\displaystyle \tt a). \ \ \bigg(26\frac{2}{3}:6,4\bigg)\cdot(19,2:3,(5))-\frac{8\dfrac{4}{7}:2\dfrac{26}{77}}{0,5-18\dfrac{2}{3}\cdot11}-\frac{1}{18}=22\frac{5114}{11061};\\\\\\3,(5)=3\frac{5}{9};\\\\1). \ \ 26\frac{2}{3}:6,4=\frac{80}{3}\cdot\frac{10}{64}=4\frac{1}{6};\\\\2). \ \ 19,2:3,(5)=19,2:3\frac{5}{9}=\frac{192}{10}\cdot\frac{9}{32}=5,4;\\\\3). \ \ 4\frac{1}{6}\cdot5,4=\frac{25}{6}\cdot\frac{54}{10}=22,5;\\\\4). \ \ 8\frac{4}{7}:2\frac{26}{77}=\frac{60}{7}\cdot\frac{77}{180}=\frac{11}{3}=3\frac{2}{3};](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Ctt%20a%29.%20%5C%20%5C%20%5Cbigg%2826%5Cfrac%7B2%7D%7B3%7D%3A6%2C4%5Cbigg%29%5Ccdot%2819%2C2%3A3%2C%285%29%29-%5Cfrac%7B8%5Cdfrac%7B4%7D%7B7%7D%3A2%5Cdfrac%7B26%7D%7B77%7D%7D%7B0%2C5-18%5Cdfrac%7B2%7D%7B3%7D%5Ccdot11%7D-%5Cfrac%7B1%7D%7B18%7D%3D22%5Cfrac%7B5114%7D%7B11061%7D%3B%5C%5C%5C%5C%5C%5C3%2C%285%29%3D3%5Cfrac%7B5%7D%7B9%7D%3B%5C%5C%5C%5C1%29.%20%5C%20%5C%2026%5Cfrac%7B2%7D%7B3%7D%3A6%2C4%3D%5Cfrac%7B80%7D%7B3%7D%5Ccdot%5Cfrac%7B10%7D%7B64%7D%3D4%5Cfrac%7B1%7D%7B6%7D%3B%5C%5C%5C%5C2%29.%20%5C%20%5C%2019%2C2%3A3%2C%285%29%3D19%2C2%3A3%5Cfrac%7B5%7D%7B9%7D%3D%5Cfrac%7B192%7D%7B10%7D%5Ccdot%5Cfrac%7B9%7D%7B32%7D%3D5%2C4%3B%5C%5C%5C%5C3%29.%20%5C%20%5C%204%5Cfrac%7B1%7D%7B6%7D%5Ccdot5%2C4%3D%5Cfrac%7B25%7D%7B6%7D%5Ccdot%5Cfrac%7B54%7D%7B10%7D%3D22%2C5%3B%5C%5C%5C%5C4%29.%20%5C%20%5C%208%5Cfrac%7B4%7D%7B7%7D%3A2%5Cfrac%7B26%7D%7B77%7D%3D%5Cfrac%7B60%7D%7B7%7D%5Ccdot%5Cfrac%7B77%7D%7B180%7D%3D%5Cfrac%7B11%7D%7B3%7D%3D3%5Cfrac%7B2%7D%7B3%7D%3B)
![\displaystyle \tt 5). \ \ 18\frac{2}{3}\cdot11=\frac{56\cdot11}{3}=205\frac{1}{3};\\\\6). \ \ 0,5-205\frac{1}{3}=-204\frac{5}{6};\\\\7). \ \ 3\frac{2}{3}:\bigg(-204\frac{5}{6}\bigg)=-\frac{11}{3}\cdot\frac{6}{1229}=-\frac{22}{1229};\\\\8). \ \ 22,5-\bigg(-\frac{22}{1229}\bigg)=\frac{55305+44}{2458}=\frac{55349}{2458}=22\frac{1273}{2458};](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Ctt%205%29.%20%5C%20%5C%2018%5Cfrac%7B2%7D%7B3%7D%5Ccdot11%3D%5Cfrac%7B56%5Ccdot11%7D%7B3%7D%3D205%5Cfrac%7B1%7D%7B3%7D%3B%5C%5C%5C%5C6%29.%20%5C%20%5C%200%2C5-205%5Cfrac%7B1%7D%7B3%7D%3D-204%5Cfrac%7B5%7D%7B6%7D%3B%5C%5C%5C%5C7%29.%20%5C%20%5C%203%5Cfrac%7B2%7D%7B3%7D%3A%5Cbigg%28-204%5Cfrac%7B5%7D%7B6%7D%5Cbigg%29%3D-%5Cfrac%7B11%7D%7B3%7D%5Ccdot%5Cfrac%7B6%7D%7B1229%7D%3D-%5Cfrac%7B22%7D%7B1229%7D%3B%5C%5C%5C%5C8%29.%20%5C%20%5C%2022%2C5-%5Cbigg%28-%5Cfrac%7B22%7D%7B1229%7D%5Cbigg%29%3D%5Cfrac%7B55305%2B44%7D%7B2458%7D%3D%5Cfrac%7B55349%7D%7B2458%7D%3D22%5Cfrac%7B1273%7D%7B2458%7D%3B)
![\displaystyle \tt 9). \ \ 22\frac{1273}{2458}-\frac{1}{18}=\frac{18\cdot55349-2458}{2458\cdot18}= \frac{496912}{22122}=22\frac{5114}{11061};](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Ctt%209%29.%20%5C%20%5C%2022%5Cfrac%7B1273%7D%7B2458%7D-%5Cfrac%7B1%7D%7B18%7D%3D%5Cfrac%7B18%5Ccdot55349-2458%7D%7B2458%5Ccdot18%7D%3D%20%5Cfrac%7B496912%7D%7B22122%7D%3D22%5Cfrac%7B5114%7D%7B11061%7D%3B)
![\displaystyle \tt b).\frac{9x+3y}{2x+2,(6)y}=\frac{3\cdot(3x+y)}{2x+2\dfrac{2}{3}y};\\\\\\2,(6)=2\frac{2}{3}};\\\\npu \ \ \ 3x=5y\\\\{} \ \ \ \ \ \ \ \ x=\frac{5}{3}y\\\\\frac{3\cdot(5y+y)}{\dfrac{10}{3}y +\dfrac{8}{3}y}=\frac{3\cdot6y}{6y}=3;](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Ctt%20b%29.%5Cfrac%7B9x%2B3y%7D%7B2x%2B2%2C%286%29y%7D%3D%5Cfrac%7B3%5Ccdot%283x%2By%29%7D%7B2x%2B2%5Cdfrac%7B2%7D%7B3%7Dy%7D%3B%5C%5C%5C%5C%5C%5C2%2C%286%29%3D2%5Cfrac%7B2%7D%7B3%7D%7D%3B%5C%5C%5C%5Cnpu%20%5C%20%5C%20%5C%203x%3D5y%5C%5C%5C%5C%7B%7D%20%5C%20%5C%20%5C%20%5C%20%5C%20%5C%20%5C%20%5C%20x%3D%5Cfrac%7B5%7D%7B3%7Dy%5C%5C%5C%5C%5Cfrac%7B3%5Ccdot%285y%2By%29%7D%7B%5Cdfrac%7B10%7D%7B3%7Dy%20%2B%5Cdfrac%7B8%7D%7B3%7Dy%7D%3D%5Cfrac%7B3%5Ccdot6y%7D%7B6y%7D%3D3%3B)
3sin^2х-4sinxcosx+5cos^2x-2=0
3sin^2х-4sinxcosx+5cos^2x-2•(sin^2x+cos^2x)=0
3sin^2х-4sinxcosx+5cos^2x-2sin^2x-2cos^2x=0
Sin^2x-4sinxcosx+3cos^x=0. (:cos^2x)
tg^2x-4tgx+3=0
tgx=t
t^2-4t+3=0
D=16-12=4
t1=(4+2):2=3
t2=(4-2):2=1
tgx=1
X=arctg1+Пк;к€Z
X=П/4+Пк;к€Z
tgx=3
X=arctg3+Пк;к€Z