-4+у+2у+1=0
3у-3=0
3у=3
у=3:3
у=1
(3x-5)^2>=(5x-3)^2
9x^2 - 2 * 3x * 5 + 25 >= 25x^2 - 2 * 5x * 3 + 9
9x^2 - 30x + 25 >= 25x^2 - 30x + 9
9x^2 - 25x^2 - 30x + 30x + 25 - 9 >= 0
-16x^2 + 16 >= 0
-16x^2 >= - 16
16x^2 =< 16
x^2 =< 1
<span>x =< 1</span>
1)a(a+b)+x(a+b)=(a+b)(a+x)
2)x+y-x(x+y)=(x+y)(1-y)
3)6(m-2)+n(m-2)=(m-2)(6+n)
4)a(4b^2+5b+1)
1 - 7 = - 6
Так как (7^(1/2))^2 = 7^2/2 = 7^1