-(x-1)*[8(50x+25)]=224(x-1)(50x+25)=-2850x²-25x+3=0(10x-3)(5x+1)=0x=3/10,x=-1/5这样可以么？
200+400x-200x-400x^2=224400x^2-200x+24=0100x^2-50x+6=0x=3/10 x=1/5
