若2x+6=18,则3x+15=()
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
若X=19/√19+8√3 则分式X^4-6X^3-2X^2+18X+23\X^2-8X+15
若X=√19-8√3 则分式X^4-6X^3-2X^2+18X+23\X^2-8X+15 的值
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若x^2+3x-(1)/(3)=0,则(x-3)/(3x^2-6x)/[x+2-(5)/(x-2)]的值是多少
若2x平方-5x+5=0,求代数式:(15x平方-18x+9-(-3x平方+19x-31)-8x的值
解方程(x-2)X(x的平方-6x-9)=x(x-5)X(x-3)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
计算1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=?
若x^2-8x+13=0求(x^4-6x^3-2x^2+18x+23)
15x(3x-8)-4X(2X+3)=6X(4X-4)-4
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550