9/8:2/5=1.25:x怎么解

9/8:2/5=1.25:x怎么解 x+1.25x=9怎么解? 8(3x-1)-9(5x-110-2(2x-70)=30怎么解? 1/(x+1)(x+2)+1/(x+3)(x+4)+1/(x+5)(x+6)+1/(x+7)(x+8)+1/(x+9)(x+10)怎么解 5x-9=x怎么解 5x=8x怎么解 9-2x=x怎么解 2x=5x怎么解 2x=5x怎么解? 8x-9=5x+9怎么解?、 8%X+(60-X)9%=5怎么解呀? 5x+3=8x-9怎么解 7x+9=8x+5-3怎么解 5X-2X=9分之2怎么解 (8-2x)(5-2x)=18怎么解 x-2/5x=9 这方程怎么解 9/25x=2/5x怎么解 -5x^2+12x=9 怎么解