1260*(2/3)=840 кг -продали в первый день
1260-840=420 кг осталось после 1го дня
420*(5/7)=300 кг продали во 2й день
420-300=120 кг осталось
ответ 120 кг
Ответ:
a) ![F(x)=x+\frac{x^{3}}{3} +3\frac{1}{3}](https://tex.z-dn.net/?f=F%28x%29%3Dx%2B%5Cfrac%7Bx%5E%7B3%7D%7D%7B3%7D%20%2B3%5Cfrac%7B1%7D%7B3%7D)
b) ![\F(x) =\frac{3*x^{2}}{2} -7*x+12](https://tex.z-dn.net/?f=%5CF%28x%29%20%3D%5Cfrac%7B3%2Ax%5E%7B2%7D%7D%7B2%7D%20-7%2Ax%2B12)
Пошаговое объяснение:
a) f(x)=1+x²; F(-1)=2
![F(x)=\int\limits {(1+x^{2}) } \, dx =x+\frac{x^{3}}{3} +C\\F(-1)=2\\2=-1+\frac{(-1)^{3}}{3} +C\\2=-1-\frac{1}{3} +C\\C=2+1+\frac{1}{3}=3\frac{1}{3}\\F(x)=x+\frac{x^{3}}{3} +3\frac{1}{3}](https://tex.z-dn.net/?f=F%28x%29%3D%5Cint%5Climits%20%7B%281%2Bx%5E%7B2%7D%29%20%7D%20%5C%2C%20dx%20%3Dx%2B%5Cfrac%7Bx%5E%7B3%7D%7D%7B3%7D%20%2BC%5C%5CF%28-1%29%3D2%5C%5C2%3D-1%2B%5Cfrac%7B%28-1%29%5E%7B3%7D%7D%7B3%7D%20%2BC%5C%5C2%3D-1-%5Cfrac%7B1%7D%7B3%7D%20%2BC%5C%5CC%3D2%2B1%2B%5Cfrac%7B1%7D%7B3%7D%3D3%5Cfrac%7B1%7D%7B3%7D%5C%5CF%28x%29%3Dx%2B%5Cfrac%7Bx%5E%7B3%7D%7D%7B3%7D%20%2B3%5Cfrac%7B1%7D%7B3%7D)
b) f(x) = 3·x-7; F(0) = 12
![F(x) =\int\limits{(3*x-7)} \, dx =\frac{3*x^{2}}{2} -7*x+C\\F(0)=12\\12=\frac{3*0^{2}}{2} -7*0+C\\C=12\\F(x) =\frac{3*x^{2}}{2} -7*x+12](https://tex.z-dn.net/?f=F%28x%29%20%3D%5Cint%5Climits%7B%283%2Ax-7%29%7D%20%5C%2C%20dx%20%3D%5Cfrac%7B3%2Ax%5E%7B2%7D%7D%7B2%7D%20-7%2Ax%2BC%5C%5CF%280%29%3D12%5C%5C12%3D%5Cfrac%7B3%2A0%5E%7B2%7D%7D%7B2%7D%20-7%2A0%2BC%5C%5CC%3D12%5C%5CF%28x%29%20%3D%5Cfrac%7B3%2Ax%5E%7B2%7D%7D%7B2%7D%20-7%2Ax%2B12)
1) 7/10 +3 /5 = 7/10 + 3*2/10 = 7/10 + 6/10 =13/10
2) 1/6 + 2/3 = 1/6 + 2*2/6=1/6+4/6 = 5/6
3)13/10 -5/6 = 13*3/30 - 5*5/30 = 39/30 - 25/30 = 14/30 = 7/15
1,75 - (7/15 : 1 13/15 + 3/8) = 1 1/8 (в обыкновенных дробях)
1) 7/15 : 1 13/15 = 7/15 : 28/15 = 7/15 * 15/28 = 1/4
2) 1/4 + 3/8 = 2/8 + 3/8 = 5/8
3) 1,75 - 5/8 = 1 3/4 - 5/8 = 1 6/8 - 5/8 = 1 1/8
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1,75 - (7/15 : 1 13/15 + 3/8) = 1,125 (в десятичных дробях)
1) 7/15 : 1 13/15 = 7/15 * 15/28 = 1/4 = 0,25
2) 0,25 + 3/8 = 0,25 + 0,375 = 0,625
3) 1,75 - 0,625 = 1,125
Можешь проверить, найдя производную.