wedż na dajspisać.pl i wybierz książke i masz roz wiazenie bez problemu
a) 3x(x-2)+5=3+x(2+3x) 3x² - 6x + 5 = 3 + 2x + 3x² 3x² - 3x² - 6x - 2x = 3 - 5 - 8x = - 2 x = 2/8 = 1/4 b)2y+5y(2-y)=3-5y² = 2y + 10y - 5y² = 3 - 5y² - 5y² + 5y² + 10y = 3 10y = 3 y = 3/10 c)2(x-2)²+5(7x-3)=2(x-1)(x+1)-17 2(x² - 4x + 4) + 35x - 15 = 2(x² - 1) - 17 2x² - 8x + 8 + 35x - 15 = 2x² - 2 - 17 2x² - 2x² - 8x + 35x = - 2 - 17 - 8 + 15 27x = - 12 x = - 12/27 = - 4/9 d)3z(z+3)+(z-2)(z+1)=(2z+5)²-3 3z² + 9z + z² - 2z + z - 2 = 4z² + 20z + 25 - 3 4z² + 8z - 2 = 4z² + 20z + 25 - 3 4z² - 4z² + 8z - 20z = 25 - 3 + 2 - 12z = 24 z = - 24/12 = - 2 e)4(x-2)-5(3x-9)=0 4x - 8 - 15x + 45 = 0 - 11x = - 45 + 8 - 11x = - 37 x = 37/11 = 3 4/11 f)2(3-x)+5=3-2(x-4) 6 - 2x + 5 = 3 - 2x + 8 - 2x + 2x = 11 - 11 0 = 0 równanie tożsamościowe