Covx2x-3y
y"=(y')^3+y'优化一下,y=arcsin（c1*e^x）+c2
y(y+4)-y(y-3)-9y详细解答y(y+4)-y(y-3)-9y=y[y+4-(y-3)-9]=y(y+4-y+3-9)=y(-2)=-2yy(y+4)-y(y-3)-9y=y(y+4-y+3-9)=-2y提取一个y就可以了1ok-
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(3y^2+8y-3)-6y(3y+2y-1)+9y求导?求偏导?求微分?给题目呀
(3y+2)(y-4)-3(y-2)(y-3)=3y^2-10y-8+3y^2+15y-18=6y^2+5y-266(3y+2)(y-4)-3(y-2)(y-3)=3y^2-10y-8-3(y^2-5y+6)=3y^2-10y-8-3y^2
(3x-y)(3y+x)-(x-y)(x+y)(3x-y)(3y+x)-(x-y)(x+y)=9xy+3x²-3y²-xy-(x²-y²)=3x²+8xy-3y²-x²+
(y^2)^4y-(-2y)^3y^6=(y^2)^4y-(-2y)^3y^6=y^8*y+8y^3y^6=y^9+8y^9=9y^9
3y/x*x-y*y+x/x*x-2xy+y*y+6y*y/x*x*x-x*x*y-xy*y+y*y*y等于多少?3y/(x^2-y^2)+x/(x^2-2xy+y^2)+6y^2/(x^3-x^2y-xy^2+y^3)=3y/[(x+y)
(y+3)(4y-1)4y^2+12y-y-3＜12y^2-30y-2y+5-38y^2-43y+5＞0根据韦达定理8y^2-43y+5=0的两个根为：[43±√（43×43-4×8×5）]/2×8=[43±√（1849-160）]/16=
[(-3-y)-y]^2怎麼算,原式=(﹣3－y)²－2(﹣3－y)•y+y²=9+6y+y²+6y+2y²+y²=4y²+12y+9；（-3-2Y）＾2＝（-3）＾2
通分y+3/y*y-6y+9,1/2y+6,y-1/y*y-9y²-6y+9=(y-3)²2y+6=2(y+3)y²-9=(y+3)(y-3)最简公分母是2(y+3)(y-3)²(y+3)/(y
计算：[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1)[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1)=[(y+1)/(y-1)(y-3)减
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-
解(y-3分之2y+y+3分之y）×y分之y²-9原式=2y/(y-3)×(y+3)(y-3)/y+y/(y+3)×(y+3)(y-3)/y=2(y+3)+(y-3)=2y+6+y-3=3y+3解:((2y/y-3)+(y/y+3
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