5：8=40:X

(16x-13)/(4x-3)-(20x-24)/(4x-5)=(32x-30)/(8x-7)-(40x-43)/(8x-9)求x x^2- +40=(x-5)(x-8) 15X+5=8X+40 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? [X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X最后答案等于X=40 （16x-13)/(4x-3)+（40x-43)/(8x-9)=（32x-30)/(8x-7)+（20x-24)/(4x-5).... （16x-13)/(4x-3)+（40x-43)/(8x-9)=（32x-30)/(8x-7)+（20x-24)/(4x-5) (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? (x+7/x+6) +(x+9/x+8)=9x=(x+10/x+9) +(x+6/x+5) x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? x-2=(104-x)+2 6x-59=10x-75 (x+10)+(x-15)=280-x4（x-62)=x-38 60x-40=(60+20)*(x-5) 32x+32*0.5-25x+64x=24x+496-49x x+15=3*(109-x ) 5(3x-1.4)=2(6x-0.5) 3(x+0.9)=5(x-1.7) 13x-4(2x+5)=17(x-2)-4(2x-1) (13x+8)/3=5x-1x-60=2[(3561-x)+100]+1 (x+9)+12=2[(x-9)-1 3x+5x=8x. 8x-5x=()x 8x(x-5)=3x (x+8)(x+6)(x+7)+(x+5)(x+6)(x+7)=(x+5)(x+8)(x+7)+(x+5)(x+8)(x+6) 1.75％X=15.52.180*40％X=8/53.4X+5％X=3/4 X+8/X=40