1) ...= х^2 * (x+3) + 3 * (x+3) = (x^2+3) * (x+3)
2) ...= x * (x-2) + y * (2-x) = (x-y) * (x-2)
* - эт умнож, если что ))
<span>1) x^2-4x+3=0
х</span>² -2х*2 +4 - 4 +3 = 0
<span>(х-2)</span>² = 1
<span>х -2 = 1 или х -2 = -1
х = 3 х = 1
2)x^2 - 6x+5=0
х</span>² -2х*3 +9 -9 +5 = 0
<span>(х-3) = 4
х-3 = 2 или х -3 = -
х = 5 х = -1
3)x^2+8x-20=0
х</span>² +2х*4 +16 -16 -20 = 0
<span>(х+4)</span>² = 4
<span>х +4 = 2 или х +4= -2
х = -2 х = -6
4)x^2+12x+32=0
х</span>² +2х*6 +36 -36 +32 = 0
<span>(х +6)</span>² = 4
<span>х +6 = 2 или х +6 = -2
х = -4 х = -8
5)x^2-2x-15=0
х</span>² -2х*1 +1 -1 -15 = 0
<span>(х-1)</span>² = 16
<span>х-1 = 4 или х-1 = -4
х = 5 х = -3
6)X^2-4x-45=0
х</span>² -2х *2 +4 -4 -45 =0
(х-2)² = 49
х-2 = 7 или х -2 = -7
х = 9 х = -5
Tg5π/6·cos7π/4<0
tg5π/4<0;cos7π/4>0;
<span>-5,64-(-10,006)+15,634=</span>-0.012
X4 -10x2+9=0
x2 = t
t2 - 10t +9=0
D=100- 4*1*9=100-36=64
t1 = 10+8 / 2=9
t2=10-8 / 2=1
x2=t
x2=1
x1,2=+-1
x2=9
x2,3=+-3