x^2+2x＋4≥0

一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X 已知函数f(x)={x^2+4x,(x≥0) 4x-x^2,(x 用MATLAB求解以下优化问题设计变量：X = {x1,x2 ,x3 ,x4}T约束条件：g1( X )=-x(1)* x(1)-x(2)* x(2)- x(3)* x(3)- x(4)* x(4)- x(1)+ x(2)- x(3)+x(4)+9≥0g2( X )=-x(1)*x(1)-2*x(2)*x(2)-x(3)*x(3)-2*x(4)*x(4)+x(1)+x(4)+8≥0g3( X )= -2*x(1) f(x)分段函数-x^2+x(x≥0),x^2+x(x *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 设f (x)={2x+1(x≥0),x²+4(x x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002 (x/x-2-x/x+2)/4x/x-2 已知f(x)是偶函数,x≥0时,f(x)=-2x²=4x,求x x^2-4x-12≥06-5x-x^2≥00≤x^2+4x≤5x^4-4x^2-12≥0 2/(x-2)-4*x/(x*x-4)=0 x>0,(x^2+2x+4)/x (x-2)(x-4)+4x(x-3)=0 设偶函数f(x)满足f(x)=2ˆx-4(x≥0),则{x|f(x-2)>0}=1.{x|x〈-2或x〉4}2.{x|x〈0或X＞4}3.{x|x＜0或x＞6}4.{x|x＜-2或x＞2} 解分式不等式(x+2)/(x+1)+(x+3)/(x+2)≥(x+1)/x+(x+4)/(x+3) 1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^+x^6+x^7+x^8的值 如果1+x+x^2+x^3=0,求x+x^2+X^3+x^4+x^5+x^6+x^7+x^8的值,