Вправа 201 - 300 » 227

227. Виконайте множення. a) (a+ b)/x • 〖3x〗^2/(2(a+ b)) = ((a+ b)•〖3x〗^2 )/(2x(a+ b)) = 3x/2; б) 1/(x^2-y^2 ) • (x- y)/4xy = (x- y)/(x- y)(x+ y)4xy = 1/(4xy(x+ y)); в) 3/(x^2-y^2 ) • 〖(x+ y)〗^2/3 = (x+ y)/(x- y); г) (a^2- ab)/m • m^2/(a- b) = (a(a- b)m^2)/(m(a- b)) = am; ґ) 3ax/(ax+ ac) • (cx+c^2 )/9x = (3ax• c(x+ c))/(a(x+ c)•9x) = c/3; д) 6m/(a^2- a) • (2a-2)/〖9m〗^2 = (6m•2(a-1))/(a(a-1)• 〖9m〗^2 ) = 4/3ma.