2х=3/5+5
х=5 3/5:2
х=5.6:2
х=2.8
64x^2-9=0
(8x)^2-3^2=0
(8x-3)(8x+3)=0
8x-3=0 8x+3=0
8x=3 8x=-3
x=3/8 x=-3/8
Ответ:-3/8; 3/8
9a²+6a+1-4b²=(3a+1)²-(2b)²=(3a+1-2b)(3a+1+2b)
25a²-(4b²-4b+1)=(5a)²-(2b-1)²=(5a-2b+1)(5a+2b-1)
Lg (xˇ2-x)=1-lg 5
lg (xˇ2-x)+lg 5 = 1
lg 5(xˇ2-x)= lg 10
5xˇ2-5x=10
5xˇ2-5x-10=0
xˇ2-x-2=0
(x-2)(x+1)=0
x1=2, x2=-1