1) 4u²-12uv+9v² 2u-3v (2u-3v)²
... = ------------------ : --------- =------------ =2u-3v=2(1+3√7)-3(2+2√7)=2+6√7-6-6√7=-4
u u 2u-3v
2)
4x²+y²+4xy 1 (2x+y)² 1 1 1 1 1
...= ----------------- * ------------ = ------------ * ----------- = ------ = ---------------- = -------- = -----
xy (2x+y)² xy (2x+y)² xy √20 * √0,8 √16 4
3)
a²-4ab² 2b+a (a-2b)(a+2b) * b a-2b (16√5-8√5) 8√5 8 1
... = ----------- : --------- = ----------------------- = ---------- = ----------------- = --------- = ------- = ------
ab b ab * (2b+a) a 16√5 16√5 16 2