Определим расстояние,которое прошел первый лыжник:
S=200•20=4000
которое прошел второй лыжник:
S=190•200=3800
Искомое расстояние:
S=3800+4000=7400
<span>1 + 2 + 34 + 56 + 7 = 100 !</span>
1)
10% это 0,1
1-0,1=0,9
11% это 0,11
1+0,11=1,11
0,9*1,11=0,999
0,999<1
1-0.999=0,.001
0,001 это 0,1%
Ответ: собирать стали меньше, на 0,1%
2)
![1 \frac{11}{12} +6*(2 \frac{5}{12}- \frac{5}{8}):18 \frac{3}{7}](https://tex.z-dn.net/?f=1+%5Cfrac%7B11%7D%7B12%7D+%2B6%2A%282+%5Cfrac%7B5%7D%7B12%7D-+%5Cfrac%7B5%7D%7B8%7D%29%3A18+%5Cfrac%7B3%7D%7B7%7D+++)
переведем к неправильным дробям:
![\frac{1*12+11}{12} +6*( \frac{2*12+5}{12}- \frac{5}{8}): \frac{18*7+3}{7}= \\ \\ = \frac{23}{12}+6*( \frac{29}{12}- \frac{5}{8}): \frac{129}{7}= \\ \\ = \frac{23}{12}+6*( \frac{29*2}{12*2}- \frac{5*3}{8*3})* \frac{7}{129}= \\ \\ = \frac{23}{12}+6* \frac{29*2-5*3}{24}* \frac{7}{129}= \\ \\ = \frac{23}{12}+ \frac{6*(58-15)*7}{24*129}= \\ \\ = \frac{23}{12}+ \frac{6*43*7}{24*3*43}= \\ \\ = \frac{23}{12}+ \frac{7}{12}= \\ \\ \frac{23+7}{12}= \frac{30}{12} = ](https://tex.z-dn.net/?f=+%5Cfrac%7B1%2A12%2B11%7D%7B12%7D+%2B6%2A%28+%5Cfrac%7B2%2A12%2B5%7D%7B12%7D-+%5Cfrac%7B5%7D%7B8%7D%29%3A+%5Cfrac%7B18%2A7%2B3%7D%7B7%7D%3D+%5C%5C++%5C%5C+%0A%3D+%5Cfrac%7B23%7D%7B12%7D%2B6%2A%28+%5Cfrac%7B29%7D%7B12%7D-+%5Cfrac%7B5%7D%7B8%7D%29%3A+%5Cfrac%7B129%7D%7B7%7D%3D+%5C%5C++%5C%5C+%0A%3D++++%5Cfrac%7B23%7D%7B12%7D%2B6%2A%28+%5Cfrac%7B29%2A2%7D%7B12%2A2%7D-+%5Cfrac%7B5%2A3%7D%7B8%2A3%7D%29%2A+%5Cfrac%7B7%7D%7B129%7D%3D+%5C%5C++%5C%5C+++++%0A%3D++++%5Cfrac%7B23%7D%7B12%7D%2B6%2A+%5Cfrac%7B29%2A2-5%2A3%7D%7B24%7D%2A+%5Cfrac%7B7%7D%7B129%7D%3D+%5C%5C++%5C%5C+++++%0A%3D++++%5Cfrac%7B23%7D%7B12%7D%2B+%5Cfrac%7B6%2A%2858-15%29%2A7%7D%7B24%2A129%7D%3D+%5C%5C++%5C%5C+%0A++%3D++++%5Cfrac%7B23%7D%7B12%7D%2B+%5Cfrac%7B6%2A43%2A7%7D%7B24%2A3%2A43%7D%3D+%5C%5C++%5C%5C+%0A+%3D++++%5Cfrac%7B23%7D%7B12%7D%2B+%5Cfrac%7B7%7D%7B12%7D%3D+%5C%5C++%5C%5C++%5Cfrac%7B23%2B7%7D%7B12%7D%3D+%5Cfrac%7B30%7D%7B12%7D++%3D+%0A)
![= \frac{5}{2} =2 \frac{1}{2} =2,5](https://tex.z-dn.net/?f=%3D+%5Cfrac%7B5%7D%7B2%7D+%3D2+%5Cfrac%7B1%7D%7B2%7D+%3D2%2C5)