✔ 最佳答案
解方程 (4x^2-19x-1)/(2x+3) = (9x-1)/(3x-4)
Sol
(4x^2-19x-1)/(2x+3) = (9x-1)/(3x-4)
(4x^2-19x-1)(3x-4)=(2x+3)(9x-1)
12x^3-73x^2+73x+4=18x^2+25x-3
12x^3-91x^2+48x+7=0
(12x^3-84x^2)+(-7x^2+49x)+(-x+7)=0
12x^2(x-7)-7x(x-7)-(x-7)=0
(12x^2-7x-1)(x-7)=0
x=7or x=(7+/-√97)/24