化简求值x方-4x-(2x方-x x方)-(3x-1) 其中x等于-3
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若X方-2XY+Y方+1XY-11=0则:x-y=0.而且xy=1所以,x=y=1,或者,x=y=-1所以,x/y=1X方+6XY+9Y方分之X方-25Y方*5X-25Y分之X+3Y=(x²
(2x-y)的十三次方除以【(2x-y)的三次方】的二次方除以【(y-2x)的二次方】的三次方=(2x-y)^13/(2x-y)^6/(2x-y)^6=2x-y=2*2-(-1)=5
(2x+1)(2x+2)(3x+4)-(x*x+2x+1),其中x=1=2(2x+1)(x+1)(3x+4)-(x+1)^2把x=1代入=2*(2*1+1)*(1+1)*(3*1+4)-(1+1)^2
原式=x³-2x²-5x-4x³-4x²+6x-1=(x³-4x³)+(-2x²-4x²)+(-5x+6x)-1=-3x
X(2X+1)(2X-3)再问:过程再答:看错了以为是-3。=2x³+4x-x²-x-3x²+2x³=4X³-4X²+3X=X(4X
:2X的平方+4X-3分之1X的平方-x+3x的平方-2x的三次方,其中X=负三=2x²+4x-x²/3-x+3x²-2x³=-2x³+14x
原式=2x²-5x²+x²+4x-3x²-2=(2x²-5x²+x²-3x²)+4x-2=-5x²+4x-2当
原式=(3x²+3x-x²+x)/(x+1)(x-1)*x(x²-1)/x²(x²-4)=(2x²+4x)/(x+1)(x-1)*(x+1)
(2x-y)的十三次方除以【(2x-y)的三次方】的二次方除以【(y-2x)的二次方】的三次方=(2x-y)的十三次方除以(2x-y)的6次方】除以(2x-y)的6次方=(2x-y)的7次方除以(2x
解【(x+2y)的平方-(x+y)(x-y)-5y方】÷(2x)=[x^2+4xy+4y^2-(x^2-y^2)-5y^2]÷(2x)=[x^2+4xy+4y^2-x^2+y^2-5y^2]÷(2x)
4x的三次方(-y的三次方)的平方-3x(—x)的平方(-y的平方)的三次方,x=-1,y=-2,=4x^3(-y^3)^2-3x(—x)^2(-y^2)^3=4x^3*(y^6)-3x*x^2(-y
1/3x的平方(3不平方)+3/4x=1/3(x+9/8)^2-27/64当x=-9/8时,有最小值-27/64
15乘以X的平方加9(4x)^2+3xy-x^2-3xy+9=16(x^2)-(x^2)+9=15(x^2)+9再问:先化简,在求值,同学,我要过程!
原式=[x/(x-1)-x/(x+1)(x-1)]÷[x(x-1)/(x-1)²]=[x/(x-1)-x/(x+1)(x-1)]÷[x/(x-1)]=[x/(x-1)-x/(x+1)(x-1
3x三次方2x二次方-{5x-2-[6-2x-(-x二次方+3x三次方)]=6X^5-[5X-2-6+2X+(-X^2+3X^3)]=6X^5-(7X-8-X^2+3X^3)=6X^5-3X^3+X^
=(x-4)/(x+1)(x-1)除以(x-4)(x+1)/(x+1)平方+1/(x-1)=(x-4)/(x+1)(x-1)乘以(x+1)平方/(x-4)(x+1)+1/(x-1)=(x-4)/(x+
原式=x³-8x²+3x+18-(x³-8x²-15x)=-12x+18=14
=x²(x-1)/x(x-1)-(1+x)(1-x)/(x+1)=x-(1-x)=2x-1当x=2时原式=4-1=3
x=-3/22(3x²-x+4)-3(2x²-2x+3)=6x²-2x+8-6x²+6x-9=4x-1=4×(-3/2)-1=-7
[2/(x+1)+4/(x²-1)]÷x/(x-1)=[(2/(x+1)+4/(x-1)(x+1)]÷x/(x-1)=[2(x-1)/(x+1)(x-1)+4/(x-1)(x+1)]÷x/(