X-0.8X=2
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
2x-0.8×2.6=3.08-2x 2.4×0.2x=0.5x-2.4 5(0.2x-2.5)=2.1x
20+0.8x=x-14 112-4x=2x(80-4x)
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/x平方-x+2=2x/x+1
4.2-0.8x=2.5x-2.4
x-2.4=1/2x+2.4
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
x-4/1x=8/3 x-0.8x=22 3/2x+2/1x=42
2+0.5x=x-2.4
解方程X-0.5X=15 X-0.8X=10 2.5X+2X=9