(2/7 - 1/14)(3.5 - 17.5) = (4/14 - 1/14)(-14) = (3/14)(-14) = -3
3ху - 3х - (х - 3ху) = 3ху - 3х - х + 3ху = 6ху - 4х
3x - 5 = 193x = 24x = 8
(5а - 2)^2 = 25а^2 - 20а + 4
-(3х - 1)^2 + 2(5 + х)(х - 5) + 7х^2 = 3-(9х^2 - 6х + 1) + 2(5х - 25 + х^2 - 5х) + 7х^2 = 3-9х^2 + 6х - 1 + 10х - 50 + 2х^2 - 10х + 7х^2 = 30 = 0 (уравнение верное для всех х)
x^5(x^2)^4 = x^5 * x^8 = x^13
(2/7 - 1/14)(3.5 - 17.5) = (4/14 - 1/14)(-14) = (3/14)(-14) = -3
23ху - 3х - (х - 3ху) = 3ху - 3х - х + 3ху = 6ху - 4х
33x - 5 = 19
43x = 24
x = 8
(5а - 2)^2 = 25а^2 - 20а + 4
5-(3х - 1)^2 + 2(5 + х)(х - 5) + 7х^2 = 3
6-(9х^2 - 6х + 1) + 2(5х - 25 + х^2 - 5х) + 7х^2 = 3
-9х^2 + 6х - 1 + 10х - 50 + 2х^2 - 10х + 7х^2 = 3
0 = 0 (уравнение верное для всех х)
x^5(x^2)^4 = x^5 * x^8 = x^13