George Washington was the first American president.
(3.1/3-4.1/2)(3.1/3+4.1/2)=(-1.1/6)(7.5/6)=-7/6 *47/6 = - 329/36 = -9.5/36
1) 3x - 5 + 3x + 17 / 2 = 6x - 0.5
2) 3x + 7 / 10 + 7x - 2 / 16 = 10x + 0.7 - 0.125 = 10x + 0.575
Раскладываем по формуле разность квадратов:
169 = 13²,значит,
13² - ( z + 7)² = ( 13 - z - 7)( 13 + z + 7)
Б) -2(b - c)/14 + 3b-c/14 = (-2b+2c + 3b - c)/14 = (b + c)/14
в) ответ (1 + a^2 - 2a)/a^2
г) (b(b-a) - a(a-b))/ab^2 = (b^2-ab-a^2+ab)/ab^2 = (b^2 - a^2)/ab^2