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Здравствуйте, xenitron. №1 y/y'=lny ydx=lnydy dx=((lny)/y)*dy lny=z=>dz=dy/y dx=zdz ?dx=(1/2)*?2zdz x+C=(z^2) x+C=(lny)^2 Решение получилось для х , но его можно легко переформировать в решение для у или даже константы С . Теперь можно решить задачу Коши : у(2)=1 . 2+С=(ln1)^2=0=>C=-2 (lny)^2=x-2=>lny=sqrt(x-2)=>y=exp(sqrt(x-2)) exp - число е в степени ... Ответ : y=exp(sqrt(x-2)) .
№2 x*sqrt(1+(y^2))*dx+y*sqrt(1+(x^2))*dy=0 x*sqrt(1+(y^2))*dx=-y*sqrt(1+(x^2))*dy (1/2)*(2x/sqrt(1+(x^2)))*dx=-(1/2)*(2y/sqrt(1+(y^2)))*dy ?d(1+(x^2))/sqrt(1+(x^2))=-?d(1+(y^2))/sqrt(1+(y^2)) 2*sqrt(1+(x^2))=2*C-2*sqrt(1+(y^2)) sqrt(1+(x^2))+sqrt(1+(y^2))=C Тут было оптимально выразить решение для постояяной С .
№3 y'+sin(x+y)=sin(x-y) y'=sin(x-y)-sin(x+y)=sinxcosy-sinycosx-sinxcosy-sinycosx=-2cosxsiny dy/dx=-2*cosx*siny ?dy/siny=-2*?cosxdx tg(y/2)=t , dy=2*dt/(1+(t^2)) , siny=2*t/(1+(t^2)) - Это такая замена для у ... ?dy/siny=?[2*(1+(t^2))*dt]/[2*t*(1+(t^2))]=?dt/t=-2*?cosxdx ln|t/2|=ln|(tg(y/2))/2|=C-2sinx ln|(tg(y/2))/2|+2sinx=C Тут тоже удобнее всего выразить решение через постоянную С .
Все задания вобщем-то элементарные , но трбует знания некоторых тонкостей из других разделов высшей математики . Прошу прощения за возможные опечатки .
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Мне безразлично, что Вы думаете о обо мне, но я рад за Вас - Вы начали думать.
Неизвестный
04.10.2010, 19:34
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это ответ
Здравствуйте, xenitron. 1) y/y'=ln(y) [$8594$] ln(y)*y'/y=1 [$8594$] (dy/dx)*ln(y)/y=1 [$8594$] ln(y)*dy/y=dx [$8594$] ln(y)*d(ln(y))=dx [$8594$] 1/2*(ln(y))2=x+C, при y(2)=1 получаем 0=2+C, С=-2 [$8594$] y(x)=exp([$177$][$8730$](2*(x-2))). 2) уравнение с разделяющимися переменными (можно свести к уравнению в полных дифференциалах с помощью интегрирующего множителя - см. далее); для начала, т.к. 1+y2[$8800$]0 и 1+x2[$8800$]0 при любом x, y, умножим исходное уравнение на 1/(([$8730$](1+x2))([$8730$](1+y2))) [$8594$] x*dx/[$8730$](1+x2)+y*dy/[$8730$](1+y2)=0 [$8594$] d([$8730$](1+x2))+d([$8730$](1+y2))=0 [$8594$] [$8730$](1+y2)=C-[$8730$](1+x2) [$8594$] y(x)=[$177$][$8730$]((C-[$8730$](1+x2))2-1). 3) y'+sin(x+y)=sin(x-y) [$8594$] y'=sin(x)cos(y)-cos(x)sin(y)-sin(x)cos(y)-cos(x)sin(y) [$8594$] dy/sin(y)=-2cos(x)dx {dy/sin(y)=sin(y)dy/sin2(y)=-d(cos(y))/(1-cos2(y))=[t=cos(y)]=dt/(t2-1)=d(1/2*ln((t-1)/(t+1)))} 1/2*ln((cos(y)-1)/(cos(y)+1))+2*sin(x)=C. 4) уравнение с разделяющимися переменными: dx/(x*(y-1))+dy/(y*(x+2))=0 [$8594$] (y-1)dy/y=-(x+2)dx/x [$8594$] y-ln(y)=C-(x+2*ln(x)) при y(1)=1 получаем 1=C-1, C=2 [$8594$] y-ln(y)+(x+ln(x2))=2.
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