1.) x²-4x+3/15-8x+x² - 5x-10/x²-3x-10
2.) 20a/1-25a² + 3/10a+2 - a²/a+5a²
3.) a+1/a²+2a-3 - a+10/a²+3a-4 + 2/a²+7a+12
Rational expressions