1) 16a^2-9b^2/(20a-15b)^2= (4a-3b)(4a+3b)/5(4a-3b)^2= 4a+3b/5(4a-3b)
2) 4y^6-4y^4/y^7+2y^6+y^5=4y^4(y-1)(y+1)/y^5(y+1)^2= 4y^4(y-1)/y^5(y+1)
<span>0,3a(4a² - 3)(2a²+5)= 0,3а*(8а^4+20a</span>²-6a²-15<span>)=2,4a^5+4,2a</span>³-5a
(2x - 5) + (- 3x +16) = (- x + 11)