3,6^2-3,6*1,2+2,4^2 = =3,6(3,6 - 1,2)+2,4^2==3,6*2,4 + 2,4^2 = 2,4(3,6 + 2,4) = 2,4*6 = 14,4
log²(1/2) x + 3log(1/2) x + 2 = 0
x > 0
log(1/2) x = t
t² + 3t + 2 = 0
D = b² - 4ac = 9 - 8 = 1
t12 = (-3 +- 1)/2 = -1 -2
t1 = -1
log(1/2) x = -1
x = (1/2)^(-1)
x = 2
t2 = -2
log(1/2) x = -2
x = (1/2)^(-2)
x = 4
ответ 2 и 4
1)(a+b)+(a+b)(a-b)=(a+b)(1+a-b)
2)(3a-b)²-4²=(3a-b-4)(3a-b+4)
3)x³(y²-1)-x(y²-1)=x(x-1)(x+1)(y-1)(y+1)
4)1-(x-2y)²=(1-x+2y)(1+x-2y)
ну лови ответ .
ответ : 30х²+13х-3-12х²= (30х²-18х²)+13х-3 = 18х²+13х-3