4*1.25x+4x=360
4x+x×1.25x=360(解方程)
4*1.25x+4x=360
4(x+1.25x)=360
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
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+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
2x+3x+4x+5x+x+6x+7x=100
先化简,再求值:(x-2/x-x+2/x)/x-2/4x,x=2011
210-x=360-4x,求x
提取公因式:已知x*x-5x+1=0 求x*x*x-4x*x-4x-1
X 7 X - X 7 X = X 9 8 X 9 X - X 9 X = 4 9
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?