ОДЗ: x/(x+5) + 7 > 0
(x+7x+35)/(x+5) > 0
(8x+35)/(x+5) > 0
__+___(-5)__-____(-35/8)___+___
![log_{11}(8x^2+7)-log_{11}(x^2+x+1) \geq log_{11}( \frac{x}{x+5} +7)\\\\ log_{11} \frac{8x^2+7}{x^2+x+1} \geq log_{11}( \frac{x}{x+5} +7)\\\\ \frac{8x^2+7}{x^2+x+1} \geq \frac{x}{x+5} +7\\\\ \frac{(8x^2+7)(x+5)-x(x^2+x+1)-7(x^2+x+1)(x+5)}{(x^2+x+1)(x+5)} \geq 0\\\\ \frac{8x^3+40x^2+7x+35-x^3-x^2-x-7x^3-42x^2-42x-35}{(x^2+x+1)(x+5)} \geq 0\\\\ \frac{-3x^2-36x}{(x^2+x+1)(x+5)} \geq 0\\\\ --+-[-12]-----(-5)----+-----[0]-----\\\\ x\in (-\infty;-12]U(-4,375;0]-s-ODZ](https://tex.z-dn.net/?f=log_%7B11%7D%288x%5E2%2B7%29-log_%7B11%7D%28x%5E2%2Bx%2B1%29+%5Cgeq+log_%7B11%7D%28+%5Cfrac%7Bx%7D%7Bx%2B5%7D+%2B7%29%5C%5C%5C%5C+log_%7B11%7D+%5Cfrac%7B8x%5E2%2B7%7D%7Bx%5E2%2Bx%2B1%7D+%5Cgeq+log_%7B11%7D%28+%5Cfrac%7Bx%7D%7Bx%2B5%7D+%2B7%29%5C%5C%5C%5C+%5Cfrac%7B8x%5E2%2B7%7D%7Bx%5E2%2Bx%2B1%7D+%5Cgeq+%5Cfrac%7Bx%7D%7Bx%2B5%7D+%2B7%5C%5C%5C%5C+%5Cfrac%7B%288x%5E2%2B7%29%28x%2B5%29-x%28x%5E2%2Bx%2B1%29-7%28x%5E2%2Bx%2B1%29%28x%2B5%29%7D%7B%28x%5E2%2Bx%2B1%29%28x%2B5%29%7D+%5Cgeq+0%5C%5C%5C%5C+%5Cfrac%7B8x%5E3%2B40x%5E2%2B7x%2B35-x%5E3-x%5E2-x-7x%5E3-42x%5E2-42x-35%7D%7B%28x%5E2%2Bx%2B1%29%28x%2B5%29%7D+%5Cgeq+0%5C%5C%5C%5C+%5Cfrac%7B-3x%5E2-36x%7D%7B%28x%5E2%2Bx%2B1%29%28x%2B5%29%7D+%5Cgeq+0%5C%5C%5C%5C+--%2B-%5B-12%5D-----%28-5%29----%2B-----%5B0%5D-----%5C%5C%5C%5C+x%5Cin+%28-%5Cinfty%3B-12%5DU%28-4%2C375%3B0%5D-s-ODZ)
694 326:6= 115 721
394 324 :7=56 332
115 721- 56 332= 59 389
59 389* 70= 4 157 230
4 157 230+ 1008 = 4 158 238
1) 1.000.000 мм = 100.000 см., 8.000.000 мм = 800.000 см., 90.000 мм = 9000 см., 6000 мм = 600 см., 600 мм = 60 см.
2) 700.000 мм = 7000 дм., 62.000 см = 6200 дм., 7300 мм = 73 дм., 490 см = 49 дм., 100 мм = 1 дм.
3) 900.000 мм = 900 м., 84.000 см 6400 дм = 1280 м., 240 дм = 24 м., 1000 мм = 1 м.
4) 4.000.000 мм =4 км., 500.000 см = 5 км., 300.000 дм. = 30 км., 24.000 м = 24 км., 1.000.000 мм = 1 км.
1) 1350*4=5400 (гр)собрал отец
2) 5400+1350=6750(гр) собрали вместе
