x/3-1/5x≤10,求x

x/3-1/5x≤10,求x 3^x=2^x,求x.5^(x-1)·10^3x=8^x求x 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少 求函数y=\x-1\+\x-2\+\x-3\+\x-4\+\x-5\+\x-6\+.+\x-10\的最小值 已知x=9/2 求:[(x^+7x+10)/(x^2+6x+5)]×[(x^3+1)/(x^2 已知3x*x-x=1,求6x*x*x+7x*x-5x+2000 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. 1）x+1/x=3,求x^10+x^5+1/x^5+1/x^10的值 求x^2-3x/x^2-6x+9*x^2-11x+30/x^2-5x-1 (x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几? 已知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