y=ex 1 arcsinln√1-x
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(1)两边对x求导,得2xy+x^2*dy/dx-1+dy/dx=0,所以dy/dx=(1-2xy)/(1+x^2)(2)两边对x求导,得√y+x*1/(2√y)*dy/dx=dy/dx,所以dy/d
2x-y+1/y=10x+1/y+x-y-2=8设x+1/y=ax-y-2=ba+b=4a^2+b^2=8b=4-aa^2+(4-a)^2=8a^2+a^2-8a+16=82a^2-8a+8=0(a-
由2x+y=1得y=1-2x代入2X^2+y^2=2(或根号二)得2x^2+(1-2X)^2=2(或根号二)6X^2-4x+1=2(或根号二)直接用求根公式即可
∵3y^2-(2y+1)(y-2)=(y-5)(y-1)==>3y^2-2y^2+3y+2=y^2-6y+5==>9y==3==>y=1/3∴原方程的解是y=1/3.
由于绝对值与根号的非负性∴2x+y=-13x+2y=0解得x=-2y=3x*y=-6
逗号表达式注意两个基本知识:1.逗号表达式的运算顺序是从左向右运算2.逗号表达式的值取逗号中最右表达式的值第一个循环:(x=0,y=1)现在看(x=3*y,x+1),x-1这个逗号表达式,首先对于(x
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x=1+√2,y=1-√2x+y=2x-y=2√2[(1/(x-y)+1/(x+y)]-【2y/(x的平方-2xy+y的平方)】=[(x+y+x-y/(x-y)(x+y)]-【2y/(x-y)^2】=
∵x-√x-1=√y+3-y==>x-√x+1/4+y-√y+1/4=9/2==>(√x-1/2)²+(√y-1/2)²=9/2∴设√x-1/2=3cosa/√2,则√y-1/2=
/>(1/x-y+1/x+y)÷x^2y^2/x^2-y^2=(2x)/(x^2-y^2)÷(x^2y^2)/(x^2-y^2)=(2x)/(x^2-y^2)÷(x^2-y^2)/(x^2y^2)=2
令y’=u则u’=1+uu积分得arctanu=x+c即y’=tan(x+c)再次积分得y=-ln丨cos(x+c)丨+c1
{[x*x-x*(x-1)]+y*y*y-5.2}*2-1={[5*5-5*(5-1)]+5*5*5-5.2}*2-1=(5+125-5.2)*2-1=259.8-1=258.8
设y'=p,y"=p(dp/dy)y·y''=1+y'^2yp(dp/dy)=1+p^2pdp/(1+p^2)=dy/y(1/2)ln(1+p^2)=ln|y|+c1+p^2=c1y^2p^2=c1y
x≤0时√x^2=-x所以y=0x>0时√x^2=x所以y=ln(2x+1)
不显含x型.令y'=p,则y"=pdp/dy,原微分方程可化为yp[dp/dy]+1=p^2即ydp/dy=(p^2-1)/p分离变量p/(p^2-1)dp=dy/y两边积分∫p/(p^2-1)dp=
∵3y^2-(2y+1)(y-2)=(y-5)(y-1)==>3y^2-2y^2+3y+2=y^2-6y+5==>9y==3==>y=1/3∴原方程的解是y=1/3.希望对你有所帮助,
求不定积分∫[y√(y+5)]dy令√(y+5)=u,则y+5=u²,y=u²-5,dy=2udu,代入原式得:原式=2∫[(u²-5)u²du=2∫(u
首先要知道逗号运算取后面那个值,所以1:x=3;y=2;2step:x=6,y=5;3step:x=15,y=14(此时y》10,所以结束)最终结果:x=15,y=14.
(y'-y/x)/(1+y'y/x)=√3/3y'x-y=√3/3x+√3/3y'yy'=(√3/3x+y)/(x-√3/3y)y'=(1+√3y/x)/(√3-y/x)令u=y/x则y'=xdu/d
(x+y^2+3)dy=(x-y+1)dx或:xdy+ydx+(y^2+3)dy-(x+1)dx=d(xy)+(y^2+3)dy-(x+1)dx=0通解为:xy+y^3/3+3y-x^2/2-x=C