化简求值4x*x (2x-1)(1-2x),其中x=1 40-搜答案-搜搜做题作业网

题目有误吧(x-x)x-1分之4(x-x)+(x-2)再问：(x方-x)(x-2)方再答：

[2x+5][2x-5]-3x[4/3x-1]=4x²-25-4x²+3x=3x-25,其中x=-2013原式=3x-25=-6039-25=-6064

(x-4)(2x-5)-(3x-2)(x+6)=(2x²-13x+20)-(3x²+16x-12)=2x²-13x+20-3x²-16x+12=-x²

【（x-2/x²+2x）-（x-1/x²+4x+4）】/（x-4/x+2)=[(x-2)/x(x+2)-(x-1)/(x+2)²]/[(x-4)/(x+2)]约去x+2=

(4x²-3x)+(2+4x-x²)-(2x²+x+1)先去括号；4x²-3x+2+4x-x²-2x²-x-1合并同类项x²+1代

原式=x^2+4x+4x^2-1-4x^2-4x=x^2-1代入x=-2原式=3

x(2x²-4x)-x²(6x-3)+x(2x）²=2x^3-4x^2-6x^3+3x^2+2x^3=-x^2-6x^3=-1/4+6/8=1/2

(x+3)(x-4)-x(x-2)=x²-x-12-x²+2x=x-12=12.5-12=0.5

结果-34,太简单了.

x²(x²-x-1)-x(x²-3x),=x^4-x^3-x^2-x^3+3x^2=x^4-2x^3+2x^2=(-2)^4-2×(-2)^3＋2×(-2)^2=16+1

化简求值：1x+2−x

原式=1x+2−(x+1)2x+2•x−1(x+1)(x−1)=1x+2−x+1x+2=−xx+2；当x=x=2-2时，原式=−2−22−2+2=2−1．

(x+2)(x-2)-(x-2)²+2x=x²-4-x²-4+4x+2x=-8+6x=-8+6=-2

1.1/(x+1)-[(x+3)/(x^2-1)]/[(x^2+4x+3)/(x^2-2x+1)]=1/(x+1)-{(x+3)/[(x-1)(x+1)]}/{[(x+1)(x+3)]/[(x-1)^

(1)化简求值:(X+2/X^2-2X-X-1/X^2-4X+4)÷X^2-16/X^2+4X,其中X=2+根号2.(X+2/X^2-2X-X-1/X^2-4X+4)÷X^2-16/X^2+4X=(x

:(x^2-4x)/(x+1)除以(4-x)/x,=x(x-4)/(x+1)*x/(4-x)=-x^2/(x+1)=-9/(-2)=9/2

1:x=2y=162.x=13y=183.x=24y=6（x）/（1+x）+（y）/（1+y）+（z）/（1+z）的值为4XY+2X的平方+2y的平方

5x²-[3x-2(2x-3)-4x²]=5x²-[3x-4x+6-4x²]=5x²-[-x+6-4x²]=5x²+x-6+4x&

原式=[(x-4)/(x+1)(x-1)]*(x+1)²/[(x-4)(x+1)]+1/(x-1)=1/(x-1)+1/(x-1)=2/(x-1)代入x=2√3-1原式=2/(2√3-2)=

[（x+2)/x-(x-1)/(x-2)]÷（x-4)/x=[1+2/x-1-1/(x-2)]×x/(x-4)=(x-4)/x(x-2)×x/(x-4)=1/(x-2)=1/(3-2)=1这是我在静心

=(x²+x-x)/(x+1)×(x+1)/(x+2)(x+1)×(x+2)(x-2)/x(x-2)=x²/(x+1)×(x+1)/(x+2)(x+1)×(x+2)(x-2)/x(