Упростите выражение. 1) а+3/а-1 + а+5/2-2а; 2) 4m/m^2 - n^2 -4/m+n , 3) 2x-y/2x+y + y/4x+2y, 4.)x^2 +y^2/x^2-y^2 - x-y/x+y , 5) 4/a^2-9 - 2/a^2+3a. 6) 1/2m-4 +m/4-m^2. 7)4x^2+4/16x^2-9 - x^2+1/4x^2-3x. 8)b/3b-1 + 3b^2-1/1-9b^2
(а+3)/(а-1) + (а+5)/(2-2а) = = (а+3)/(а-1) + (а+5)/ -2(а-1) = = (а+3)/(а-1) - (а+5)/2(а-1)= = (2(а+3) - (а+5))/ 2(а-1)= = (2а+6 -а -5) /2(а-1)= = (а+1)/2(а-1) = = (а+1)/(2а-2) 4m/(m²-n²) - 4/(m+n) = = (4m - 4(m-n) ) / (m+n)(m-n) = = (4m - 4m +4n) / (m+n)(m-n) = = 4n/(m²-n²) (2x-y)/(2x+y) + y/(4x+2y) = = (2x-y)/(2x+y) + y/2(2x+y)= = ( 2(2x-y) +y) / 2(2x+y)= = (4x-2y+y) / 2(2x+y)= = (4x-y)/ 2(2x+y) = = (4x-y) / (4x+2y) (x²+y²)/(x²-y²) - (x-y)/(x+y) = =(x²+y² - (x-y)(x-y) ) / (x-y)(x+y) = = (x²+y² - (x² -2xy +y²)) / (x-y)(x+y) = = (x² +y²-x²+2xy -y²) / (x-y)(x+y) = = 2xy / (x²-y²) 4/(a²-9) -2/(a²+3a) = = 4/(a-3)(a+3) - 2/ a(a+3) = = (4a -2(a-3)) / (a(a-3)(a+3) )= = (4a -2a+6) / a(a-3)(a+3) = = (2a+6) / a(a-3)(a+3) = = 2(a+3) / a(a-3)(a+3) = = 2/ a(a-3) 1/(2m -4) + m/(4-m²) = = 1/ 2(m-2) - m/(m-2)(m+2) = = (m+2 - 2m) / 2(m-2)(m+2) = = (-m+2) / 2(m-2)(m+2) = = - (m-2)/ 2(m-2)(m+2) = = - 1/ 2(m+2) = = - 1/(2m+4) (4x²+4)/(16x²-9) - (x²+1)/(4x² -3x) = = (4x²+4) / (4x-3)(4x+3) - (x²+1) / x(4x-3) = = (x(4x²+4) - (x²+1)(4x -3)) / ( x(4x-3)(4x+3) )= = (4x³ +4x - (4x³ -3x² +4x-3)) / (x(4x-3)(4x+3)) = = ( -3x² +3 ) / (x(4x-3)(4x+3)) = = - (3x² -3)/ (x (16x² -9 )) = = - (3x² - 3) / (16x³ -9x) b/(3b-1) + (3b² -1)/ (1-9b²) = = b/(3b-1) - (3b² -1) / (3b-1)(3b+1) = = (b(3b+1) - (3b² - 1) ) / (3b-1)(3b+1) = = (3b² + b - 3b² + 1) / (3b-1)(3b+1) = = (b+1) /(9b² - 1)
это точно правильно?
Думаю, да. Проверь сам(а) , если есть сомнения )
спасибо.вроде да