9а+6b/x²-36b:6a+4b/x²+12x+36b=3(3а+2b)/x²-36b*(x+6)²/2(3a+2b)=6(3a+2b)(3a+2b)/2x²(3a+2b) - x²*36b*(x+6)²/x²*2(3a+2b)= 3(3a+2b)/x² - 18b*(x+6)²/(3a+2b)
При а=1.7,b=x=0.5
3(3*1.7+2*0.5)/0.5² - 18*0.5*(0.5+6)²/3*1.7+0.5=
3(5.1+1)/0.25 - 9*(0.25+6+36)/5.1+0.5=
15.3/0.25-380,25/5.6=1530/25-38025/560=61,2-68=-6.8