РОЗДІЛ 2. Раціональні вирази - Вправи 50 - 200 » 188

188. Виконайте множення виразів: 1) (x – 3) • 11/(x-3) = (x-3)/1 • 11/(x-3) = ((x-3)•11)/(1 •(x-3)) = 11; 2) (3x + 2) • (–2/(2+3x)) = (3x+2)/1 • (–2/(2+3x)) = –((3x+2)•2)/(1 •(2+3x)) = –2; 3) (2a – 1) • 5/(1-2a) = (2a-1)/1 • 5/(1-2a) = ((2a-1)•5)/(1 •(1-2a)) = –((2a-1)•5)/((2a-1)) = –5; 4) (2x – 2) • 6/(x-1) = (2x-2)/1 • 6/(x-1) = ((2x-2)•6)/(1 •(x-1)) = (2(x-1)•6)/(x-1) = 12; 5) (3a + 1) • 5/(2+6a) = (3a+1)/1 • 5/(2+6a) = ((3a+1)•5)/(1 •(2+6a)) = ((3a+1)•5)/(2(1+3a)) = 5/2 = 2,5; 6) (ax – a) • 2/(x-1) = (ax-a)/1 • 2/(x-1) = ((ax-a)•2)/(1 •(x-1)) = (a(x-1)•2)/(x-1) = 2a; 7) (ax + 2a) • a/(x+2) = (ax+2a)/1 • a/(x+2) = (a(x+2)•a)/(1 •(x+2)) = a2; 8) (3b – ab) • 3/(2a-6) = (3b-ab)/1 • 3/(2a-6) = ((3b-ab)•3)/(1 •(2a-6)) = (b(3-a)•3)/(2(a-3)) = –(b(a-3)•3)/(2 •(a-3)) = –3b/2.