X/4-1=0.3X+1/0.1怎么算啊?一元一次0.3X+1/0.1 是个整的分数啊！

x-1/4x=500-x+60 怎么算 4/5x=1/4x-0.3怎么算, X/2+X/1+X/4=14,求X,具体怎么变形怎么算呢 (x^10-x^5+1)/(x^2+x+1) 怎么算?(x^10-x^5+1)/(x^2+x+1)=（x^8-x^7+x^5-x^4+x^3-x+1) (x-1)(x-2)(x-3)(x-4)-(x^2-5x)^2-10(x^2-5x)怎么算? x-1/x-2-x-3/x-4=x-2/x-3-x-4/x-5怎么做? 1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做 -x-1=0.6x=1.2怎么算x-1/0.3-2x=0.1x+0.2/0.05怎么算 x+(20%+x)+(1+20%)x+(1+20%)x.25=3700 怎么算啊 9X=1/X怎么算 X+(X-1)=90,怎么算? x^2-4x-5=（x-5）（x+1）怎么算出来的啊? (4x乘3x)+23=(4x+1)乘(3x+1)-48怎么算啊1111 1.5x-x=x(1+20%)怎么算? 1.5X+20=1X（50-X)怎么算? x(x-2)+m(1-x)=3怎么算 x(x-1)=15怎么算X? (X-3)/(X^2-4)*(X^2-4X+4)/(x^2-x-6)-1/(x+2)怎么算?(X-3)/(X^2-4)*(X^2-4X+4)/(x^2-x-6)-1/(x+2),怎么算?