3-2(0.2x+1)=0.
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
化简(2x-5)(3x+2)-6(x+1)(x-2),其中x=0.2
设f(x)=x㏑(1+x^2),x≥0.(x^2+2x-3)e^(-x),x<0,求∫f(x)dx
x-2/0.2-x+1/0.5=3 x=?
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
设f(x)=|x-1|,x≥1,f(x)=2x-3/x,x<1 ,解不等式f(x)-1≥0.
已知实数x满足x²-3x+1=0.求(1)x+ 1/x (2)x²+ 1/x² (3)x-
x+3/20x=46 ,x-1/5x=40 ,x-1/2x=3/4 ,x-0.2x=18解方程
(1)3x(x+0.2)=4x(x-1.1)
f(x-1)=x^2-2x+3(x