x²-1分之2-x²-x分之1,a-b分之a-a²-b²分之ab+a+b分之b_数学解答

x²-1分之2-x²-x分之1,a-b分之a-a²-b²分之ab+a+b分之b

人气：196 ℃　时间：2020-10-01 04:45:06

解答

2/(x²-1)-1/(x²-x)=2/(x+1)(x-1)-1/x(x-1)={2x-(x+1)}/x(x+1)(x-1)=(x-1)/x(x+1)(x-1)=1/x(x+1)=1/(x²+x)a/(a-b)-ab/(a²-b²)+b/(a+b)=a(a+b)/(a²-b²)-ab/(a²-b²)+b(a-...