Ответ:
Объяснение:
1) a/(x²-1) -b/(1-x²)=(a+b)/(x²-1)
2) (c+d)/(c²-b²) +(c-d)/(b²-c²)=(-c-d+c-d)/(b²-c²)=(-2d)/(b²-c²)
3) a/(x-y) -b/(y-x) +c/(x-y)=(a+b+c)/(x-y)
4) (x+1)/(a-b) -(x+2)/(b-a) -(x-1)/(a-b)=(x+1+x+2-x+1)/(a-b)=(x+4)/(a-b)
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Answers & Comments
Ответ:
Объяснение:
1) a/(x²-1) -b/(1-x²)=(a+b)/(x²-1)
2) (c+d)/(c²-b²) +(c-d)/(b²-c²)=(-c-d+c-d)/(b²-c²)=(-2d)/(b²-c²)
3) a/(x-y) -b/(y-x) +c/(x-y)=(a+b+c)/(x-y)
4) (x+1)/(a-b) -(x+2)/(b-a) -(x-1)/(a-b)=(x+1+x+2-x+1)/(a-b)=(x+4)/(a-b)