y=2x-In(4x)^2的拐点

x=e^(y-1)-2;即是y=e^(x-1)-2;

答案：值域：[－1/3,1/5]将y=x/(x^2+x+4)的两边同乘以x^2+x+4,整理后得：yx^2+(y-1)x+4y=0由根的判别式,△=(y-1)^2-16y^2》0即：15y^2+2y-

因为x>-2,y∈Ry=1+In(x+2)则ln(x+2)=y-1e^(y-1)=x+2x=e^(y-1)-2所以反函数就是把x跟y换一下,范围也换一下即y=e^(x-1)-2(x∈R)

2x-y分之x+y=2,则2x-y=2(x+y)4x-2y分之x+y-4x+4y分之2x-y=2(2x-y)分之x+y-4(x+y)分之2x-y=4(x+y)分之x+y-4(x+y)分之2(x+y)=

设a=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)那么y=a*(x-10);那么y^=a^*(x-10)+a*(x-10)^=a^*(x-10)+a那么y

(2x-y)/(x+y)=2两边同时乘以22*(2x-y)/(x+y)=2*2把2乘以进去,有(4x-2y)/(x+y)=4(2x-y)/(x+y)=2两边取倒数,有(x+y)/(2x-y)=1/2两

(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)=4x^2-y^2+2xy-8x^2-y^2+4xy+2y^2-6xy=-4x^2=-4(-1/4)^2=-1/4

m=-x^2-4x+5y=lnmlnm单调递增有复合函数的单调性可知求出m的单调递增区间即可m=-x^2-4x+5对称轴为x=-2开口向下-x^2-4x+5>0=>-(x+5)(x-1)>0=>-5

函数y=1+ln(x+2)===>y-1=ln(x+2)===>x+2=e^(y-1)===>x=e^(y-1)-2所以,其反函数为：y=e^(x-1)-2再问：谢谢你

两边对x求导：2-y'=(y'-1)ln(y-x)+(y-x)*1/(y-x)*(y'-1)=(y'-1)[ln(y-x)+1]2-y'=y'[ln(y-x)+1]-[ln(y-x)+1]y'[ln(

答案是2.4x-2y/x+3y=(2x-y/x+3y)乘以2=4,4x+12y/2x-y=(x+3y/2x-y)乘以4=1/2x4=2,所以代数式等于4-2=2.

∵x²+y²-4x+2y+5=0x²-4x+4+y²+2y+1=0(x-2)²+(y+1)²=0x-2=0y+1=0∴x=2y=-14x&#

即(x-2y)²=0x-2y=0所以x=2y所以原式=(2x²+2xy-xy-y²)/(4x²-4xy+y²)=(2x²+xy-y²

x平方+8x+16+y平方+6x+9=0(x+4)平方+(y+3)平方=0∴x+4=0y+3=0∴x=-4,y=-3原式=(x+2y)(x-2y)/(x+2y)平方-x/(x+2y)=(x-2y)/(

解(x-y)(x+y)-(x-2y)²+x(3x-5y)-(x-y)(x-2y)=(x²-y²)-(x²-4xy+4y²)+(3x²-5xy

先化简原式=（2X-Y)(2X+Y)+(2X-Y)(Y-4X)+2Y(Y-3X)=4x"2-y"2-8x"2-y"2+6xy+2y"2-6xy=-4x"2=-1/4可以确定上式得值

(x-y)/(x+y)=4所以(x+y)/(x-y)=1/4(x-y)/[2(x+y)]-(4x+4y)/(x-y)=(1/2)*[(x-y)/(x+y)]-4[(x+y)/(x-y)]=(1/2)*

已知(2x-y)/(x+y)=2,则(4x-2y)/(x+y)=4,(x+y)/(2x-y)=1/2,(4x+4y)/(2x-y)=2(4x-2y)/(x+y)-(4x+4y)/(2x-y)=4-2=

4x^2-2x（-x+2y),=4x^2+2x^2-4xy=6x^2-4xy代入得：=6*1+4*2=14

解y′=｛2^[In(x^2)]｝′=2^[In(x^2)]*ln2*[In(x^2)]′=2^[In(x^2)]*ln2*[1/(x^2)]*(x^2)]′=2^[In(x^2)]*ln2*[1/(