y=3

y"=(y')^3+y'优化一下,y=arcsin（c1*e^x）+c2

已知XY.Y=-3,求-XY(X.X.X.Y.Y.Y.Y.Y.Y.Y-3.X.X.Y.Y.Y.Y.Y-Y)的值.（过程完整）=-(xy^2)^4+3(xy^2)^3+(xy^2)^2=-27-27-3=-57xy^2=-3-XY(X.X.X

(y^2)^4y-(-2y)^3y^6=(y^2)^4y-(-2y)^3y^6=y^8*y+8y^3y^6=y^9+8y^9=9y^9

数学题=y(y+3)-4(y+3)2=(y+3)(y-4y-12)(y+3)^2/8-y=(y+3)/4-(y-1)/2各项都乘以8,得(y+3)^2-8y=2(y+3)-4(y-1)y^2-2y+9=-2y+10y^2=1y1=-1y2=

y[y-3(x-y)]+y[3y-(y-3x)]=?原式=y(y-3x+3y)+y(3y-y+3x)=y(4y-3x)+y(2y+3x)=4y²-3xy+2y²+3xy=6y²原式=y（y-3（x-y）+3y-

y(y-2)²-y(y+3)(y-5)y=1/2化简求值解；y(y-2)²-y(y+3)(y-5)=y(y²-4y+4-y²+2y+15)=y(-2y+19)=1/2(-2*1/2+19)=1/2(1

y(y-2)²-y(y+3)(y-5)y=1/2化简求值y(y-2)²-y(y+3)(y-5)=y(y²-4y+4-(y²-2y-15))=y(-2y+19)=(1/2)*(-2*1/2+19)=(1

y(y-2)²-y(y+3)(y-5)y=1/2化简求值y(y-2)²-y(y+3)(y-5)=-4y²+4y+2y+15=-4y²+6y+15=-1+3+15=17不懂再问我我会说的详细点,

解方程：（y-3y+2）（y+3y-2）=y（y+3）（y-3）（y-3y+2)（y+3y-2）=[y^2-(3y-2)](y^2+3y-2)=y^4-(3y-2)^2=y^2(y^2-9)化简得12y-4=0,解得y=1/3

(y^2-3y+2)(y^2+3y-2)=y^2(y+3)(y-3)分数用完了。y^4-(3y-2)^2=y^4-9y^29y^2=(3y-2)^23y=3y-23y=-(3y-2)无解y=1/3解什麽方程都没说清楚啊可以化简12y-4=0

y-31.5=25%y+(1-25%)y*40%y-31.5=0.25y+0.3y0.45y=31.5y=70这个方程计算过程对么?如果对,为什么对呢完全正确就是这样作的

已知2x-y=0,求分式【1+（3*y*y*y/x*x*x-y*y*y）】/【1+（2y/x-y）】的值注：x*x*x-y*y*y=（x-y）*（x*x+xy+y*y）这个题lz想太复杂了,y=2x代进去,原式=(1+(24x^3/x^3-

求微分方程的通解y''-4y'+3y=0y'-y=3xy'=3x+yy''=3+y'=3x+y+3y''-4y'+3y=03x+y+3-4(3x+y)+3y=03x+y+3-12x-4y+3y=03-9x=0x=1/31.Y=C1*e^x+

求微分方程的通解y''-4y'+3y=0y'-y=3x1:y''-4y'+3y=0则特征方程是r-4r+3=0即：（r-1）（r-3）=0所以r=1或r=3则特征根是1或3则通解为：y=C1e+C2e^3,C1,C2是任意常数2：y'-y=

第一题：y^3*y''-1=0第二题：y''=(y')^3+y'y^3y''-1=0x'y'=1y''=x''/x'^2x'=pdp/dy=p^2/y^3dp/p^2=dy/y^3-1/p=-(1/2)y^(-2)+C0p=1/[(1/2)

(y-4)(3y+2)-(3y-7)(2y+1),其中y=4/3(y-4)(3y+2)-(3y-7)(2y+1)=(4/3-4)(3*4/3+2)-(3*4/3-7)(2*4/3+1)=(-8/3)*6+3*11/3=-16+11=-5吹泡

(x+y)/y=8/3则x/y=__y/x-y=___(x+y)/y=8/3则x/y=5/3y/(x-y)=3/2y/x-y没法求

(x+y)/y=8/3则x/y=__y/x-y=___∵(x+y)/y=8/3∴x/y+1=8/3∴x/y=5/3设比的每一份为t则y=3t,x=5t∴y/(x-y)=3t/(5t-3t)=3t/(2t)=3/2

2(y-4)(3y+2)-5(-3y+7)(y+1),其中y=-12(y-4)(3y+2)-5(-3y+7)(y+1)=2(-5)(-1)-5(10)0=102(y-4)(3y+2)-5(-3y+7)(y+1)=(2y-8)(3y+2)-(

y''(e^x+1)+y'=0y''=(y')^3+y'自学高数中,感激不尽(1)y''(e^x+1)+y'=0所以y''/y'+=0积分得lny'+∫1/(e^x+1)dx=c对这个再积分一次就好了(2)y''=(y')^3+y'设y'=