1) <u> 3x+3√5 </u>= <u>3(x+√5) </u>= 3
x+√5 x+√5
В1.2а*4ва-5в²а*3+(-1/2 ав * 4в)=8а²в-15ав²-2ав²=8а²в-17ав²
В2.25у²+20ху+4х²=(5у+2х)²
В3. -6х³-3(х³-1)²=-6х³-3(х⁶-2х³+1)=-6х³-3х⁶+6х³-3=-3х⁶-3
В4. (х-1)(х+1)-х(х-2)=0
х²-1-х²+2х=0
2х=1
х=0,5
В5. (5а-7в)²+70ав=25а²-70ав+49в²+70ав=25а²+49в²
16ab(17a² - b²) + 17ab(b² - 16a²) = 272a³b - 16ab³ + 17ab³ - 272a³b =
= ab³
a = 10 b = - 5
ab³ = 10 * (- 5)³ = 10 * (- 125) = - 1250
1)а) х²+4х+1= х²+2х+2х+1=(х+1)²+2х
б) 3b²-12b+11=2b²+b²-6b+9-6b+2=2b²+(b-3) ²+2
<span>в) у</span>²<span>+2у=
у</span>²<span>+2у+1-1= (у+1)</span>²<span>-1</span>
2) а)-b²+6b-8= -(b²-6b+8)= -(b²-4b+2-2b+6)= -( (b<span>-2)</span>²<span>-2</span>b+6)= 2b-6-(b<span>-2)</span><span>²</span>
<span>б)1/4у</span>²<span>-у+2=1/4у</span>²<span>-у+1+1=(1/2у-1) </span>²<span>+1</span>