19×19=361
27×27×27×27=531,441
361×531,441=191,850.201
1) - 3х^2+4х-7=0 - корней нет
корней нет
2 • (x - 2) • (x + 2) = (x - 4) • (x + 4) + (x - 3) •(x + 3) + x
2 • (x^2 - 4) = x^2 - 16 + x^2 - 9 + x
2x^2 - 8 = 2x^2 - 25 + x
-8 = -25 + x
- x = -25 + 8
-x = -17
x = 17
@iGeniusOX⚡
<span>(2xy)</span>³ * <span>(-3xy)</span>² = 8х³у³ * 9х²у² = 72х⁵у⁵
<span>a²-8a+16=(а-4)²
9x²+6x+1 =(3х+1)²
40xy+16x²+25y² =(4х+5у)²
a⁸-4a⁴b+4b²
=(а⁴-2в)²</span>