4(x+3)^2-25(x-2)^2=0 4（x+3)^2=25(x-2)^2 （x+3)^2/(x-2)^2=(±5/2)^2 (x+3)/(x-2)=±5/2 ① (x+3)/(x-2)=5/2 j解得x=16/3 ②(x+3)/(x-2)=-5/2 解得x=4/7
