(21+X)÷（18-X)=2

已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值 x^2=(x+30)X(x-18)怎么解 (2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1 解方程. 1、x+21%x=36.3 2、x-29%=213 3、60%x+25%x=10.2 4、90%x-18%x= 2x^2-4x/x+2`x^2+2x/x^2-4x+4÷x/3x-6,其中x=根号3/2 [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 X(x+3)分之一+(X+3)(X+6)分之一+(X+6)(X+9)分之一=2x+18分之三 1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18 1. x+0.5x=6 4x+16=40 x/5=32% x-4/9x=10/21 x-1/8x=5/8 7x÷2=2. 先化简再求值:x^3-2x^2+4x/x^2-4x+4÷x^2-2x+4/x-2,其中x=4 (x^2-6x+9)÷x^2-9x+18/x+3 已知(x-根号2+1)(x-2)=0,求代数式[(x-1)/(x-3)-(x-4)/x]÷（x^2+x-6)/(x^2+