(5x-1200)/(4x-1000)=13比10

(5x-1200)/(4x-1000)=13比10 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 (5X-1200)×13/10=4X-1000 (5x-1200)/(4x-1000)=13/10 x比【x-180]=5比3 8比5分之4=0.7比X 12比3=x比5 解方程8分之3比10分之9=x比5分之2 2分之1比7分之2=3分之1比4x 0.5/x=5.2/4 （x-1）/5分之 y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10), 解比例 3比2.5x=x比40 x分之1.2=5分之6 x比4分之9=3分之8比5 1.2比3=5分之2比x 1/2比1/3=1/4比x,5/12=2.5/x,9比2.5=3.6比x,24/x=1.8/2.4,x比2/3=1/8比