1/2÷10+1/2x÷30-40/60=1/2x÷（10+30） 1/2÷10+1/2x÷30-40/60=1/2x÷（10+30） 帮帮忙大学霸们,

化简(x^2-2x+1)/(x^2+1)÷(x-1)/(x^2+x)-x 60％x+25=40 x+30％x=52 19-120％x=7 4分之3x-5％x=17.5 x-10％x=18 （1-25％）x=36 2x+30％x=9.2 [x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简[x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简 【{x²-4x+4/x²-4}-x/x+2】÷x-1/x+2 (x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3 x^2-10x+25/x-1÷x^2-1/5-x 1.x/x-y * y^2/x+y -x^4y/x^4-y^4÷ x^2/x^2+y^2 2.(x^2-4/x^2-x-6+ x+2/x-3)÷ x+1/x-33.(x+1-1/1-x)÷（x- x^2/x-1)4.x-1/x^2+3x+2/6/2+x-x^2-10-x/4-x^21111111111111111111111111111111 x/x^2-2x÷(x^2-4)^-1 (x²-x+1)÷(x²-x-1)=(x²+x)÷(x²+x-2)解方程 解方程 40%x+2=12 x+25%x=10 x-30%x=1.4 15x-60=240 x+1解方程40%x+2=12x+25%x=10x-30%x=1.415x-60=240x+129%x=88 (2x-6)/(x^2-9)+(x^2+2x+1)/(x^2+x-6)÷(x+1)/(x-2) 计算：x^2-1/x^2+4x+4÷（x+10）×2x+4/x-1 X^2-3X-2=0,求( x - 2x-1/x )÷(x-1)/(x^2-2x) 化简(x^2-1)(x+1)/x^2-x÷(1 +x^2+1/2x) x²-1/x²-2x+1÷x+1/x-1 X 1-x/1+x 计算:2x/(x-2)(x+1)÷(1－x/x+1)-x²+2x/x²-4? (x+2/x^2-2x-x-1/x^2-4x+4)÷4-x/x 分式化简1-[(x-1)/x]÷{[x/(x+2)] -[1/(x^2+2x)]}