2-0.2x=18x

90-x=2x(18+x) x/(x^2+6x+18)=? 2-0.2x=18x 18%x+32%x=2 x+20%x=2.4 x+5%x=4.2 15%x+35%x=0.2 x+3/20x=46 ,x-1/5x=40 ,x-1/2x=3/4 ,x-0.2x=18解方程 (x-1)+(x+2)+0.2x+2x=46 x+(x+3)+2x+(2x-18)=255 x^2=(x+30)X(x-18)怎么解 (x+30)*(x-18)=x*x f(x)=x^2+x (x 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) 解方程 式子 6-2x+3x=3x-4x+3x+18 6-x+3x=2x-5x+1 2x-1=5x-36-2x+3x=3x-4x+3x+18 6-x+3x=2x-5x+12x-1=5x-3 x^2+x^-2=x^4,化简(x+x^-1+x2)(x-x^-1+x²)（-x+x^-1+x²）(x+x^-1-x²)第18题, 已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值紧急,,明天有用,, 1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18 1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18 1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18 先化简,再计算2x^-18/4-4x+x^ ÷ 3-x/x^+x-6,其中x=4