<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
(2у+х)³-(2х-у)³ = 8y³ + 4y²x + 2yx² + x³ - (8x³ - 4x²y + 2xy² - y³) = 8y³ + 4y²x + 2yx² + x³ - 8x³ + 4x²y - 2xy² + y³ = 9y³ + 2y²x + 6yx² - 7x³
Ответ: 9y³ + 2y²x + 6yx² - 7x³