2X+5=8求x=?

3^x=2^x,求x.5^(x-1)·10^3x=8^x求x 已知x=2π+1求 |x-1|+|x-2|+|x-3|+|x-4|+|x-5|+|x-6|+|x-7|+|x-8|+|x-9|+|x-10| 已知x=2π+1.求(X-1)+(X-2)+(X-3)+(X-4)+(X-5)+(X-6)+(X-7)+(X-8)+(X-9)+(X-10) 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, 5x-2=7x-8求x 设x= -5/2,求6x+(x/x-2 - x/x+2)/4x/x^4-2x^3+8x-16的值 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少 x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x (x+3)(2x+5)-(2x-1)(x-8)=0求x x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? 已知x^5+x^4-5x^3-2x^2+4x-8 求x+1/x已知x^5+x^4-5x^3-2x^2+4x-8 求x+1/x出错了!已知x^4-5x^3+8x^2-5x+1=0 求x+1/x X+2分之X+3-X+4分之X+5=X+6分之X+7-X+8分之X+9,求X的值 matlab中a(x)=x^4+3x^3+9x-18 b(x)=x^5-4x^3-18x+7 c(x)=x^7+6x^5+9x^3-5x^2-2 d(x)=x^9-8x^7+6x^5-4x^4+d(x)=x^9-8x^7+6x^5-4x^4+6x^2+3 求e(x)=a(x)*b(x)*c(x)*d(x) 已知2^x+2^-x=5 (1)求4^x+4^-x (2) 8^x+8^-x 3Q x^2(x^2+5x-6)-(x^2+8x+12)=0求X的值 已知x^4-5x^3+8x^2-5x+1=0 求x+1/x 已知函数f(x)=|x-2|-|x-5|求不等式f(x)≥x＾2-8x+15 求方程解x-5/x-4+x-9/x-8=x-8/x-7+x-6/x-5