1.
2x/2x+5 + 5/5x-2 = 1
2.
7/x^2+x + 4/x^-x = 6/x^-1
參考答案:1. 2x/(2x+5)+ 5/(5x-2)=1
解:2x/(2x+5)+ 5/(5x-2)=1
2x(5x-2)+5(2x+5)=(2x+5)(5x-2)
10x^2-4x+10x+25=10x^2-4x+25x-10
10x^2+6x+25=10x^2+21x-10
6x-21x=-10-25
-15x=-35
x=7/3
由于是分式方程,所以一定要检验,经检验,x=7/3符合要求。
2. 7/(x^2+x) + 4/(x^2-x) = 6/(x^2-1)
解:7/x(x+1)+4/x(x-1)=6/(x+1)(x-1)
7(x-1)+4(x+1)=6x·············注:方程两边同乘以:x(x+1)(x-1);
7x-7+4x+4=6x
11x-3=6x
5x=3
x=3/5
经检验,x=3/5符合要求。