3000+50x-1500=2400+40x 两步

3000+50x-1500=2400+40x 两步 50x(x-1)+60x(x-4)=5100 (2400-2000-X)*(8+X/50*4)=? X-X/12-X/7-X/8-X/4-X/20-X/5-30-120-300=50解方程 x+ x+(x*50%)=1.5X? 看下题!1500/x-(300/x+1200/2x)=4 x/6+3000-x/4=600 1500/x-1300/1.5x=4 x/50-4=x/60+2 x=? x+(2-x)+(4-x)=50怎么解 =(x^2-5x)^2+10(x^2-5x)+24 =x^4-10x^3+25x^2+10x^2-50x+24 这是怎么转化的(X-1)(X-2)(X-3)(X-4) =(X-1)(X-4) (X-2)(X-3)=（x^2-5x+4)(x^2-5x+6)=(x^2-5x)^2+10(x^2-5x)+24=x^4-10x^3+25x^2+10x^2-50x+24=x^4-10x^3+35x^2-50x+24 =（x^2-5x+4)(x^2-5x+6) =(x^2-5x)^2+10(x^2-5x)+24 是怎么转化的(X-1)(X-2)(X-3)(X-4) =(X-1)(X-4) (X-2)(X-3)=（x^2-5x+4)(x^2-5x+6)=(x^2-5x)^2+10(x^2-5x)+24=x^4-10x^3+25x^2+10x^2-50x+24=x^4-10x^3+35x^2-50x+24不好意思我弄错了，是=（x^2-5 20%=(X+4)/(50+X)x=?(50g*8%)+(x*40%)=(50+x)20%，x=？ 4x+5=50 x= 4x-50=7x-56 3x+50=4(x-3) 4x+2(20-x)=50 20%X=50-X+4