3.Wykonaj mnożenie i zredaguj wyrazy podobne: 4a(5b-a)-4(2a²- 2ab)=20ab-4a²-8a²+8ab=-12a²+28ab (5a-2)(5a+2)=25a²+10a-10a-4=25a²-4 4.Rozwiąż równania 3(2x-4)=2x+8 6x-12=2x+8 6x-2x=8+12 4x=20/:4 x=5 8(3x-2)-13x=5(12-3x)+7x 24x-16-13x=60-15x+7x 24x-13x+15x-7x=60+16 19x=76/:19 x=4
4a(5b-a)-4(2a,,do kwadratu" - 2ab)=20ab-4a²-8a²+8ab=-12a²+28ab (5a-2)(5a+2)=25a²+10a-10a-4=25a²-4 3(2x-4)=2x+8 6x-12=2x+8 6x-2x=8+12 4x=20 /:4 x=5 8(3x-2)-13x=5(12-3x)+7x 24x-16-13x=60-15x+7x 11x+8x=60+16 19x=76 /:19 x=4
4a(5b-a)-4(2a,,do kwadratu" - 2ab) 20ab-4akwadrat-8akw.-4akw.+8ab=28ab-12a kwadr. (5a-2)(5a+2)=25a kw+15a-10a+4 25ak kwadr. +5a+4 3(2x-4)=2x+8=6x-12=2x+8 2x-6x=-8-12 -4x=20/4 x=5- 8(3x-2)-13x=5(12-3x)+7x 24x-16-13x=60-15x+7x 11x-16=60-8x 19x=-76/19 x=4
