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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
(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
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