1)
2)
1) (2а+3)(а-3)-2а(4+а)
2а²-6а+3а-9-8а-2а²
-6а+3а-9-8а
-11а-9
2) (1-х)(х+1)+(х-1)²
(1-x) x (x + 1) + (-(1-x)) ²
(1-x) x(x+1) + (1-х)²
(1-x)x(x+1+1-x)
(1-x)*2
2(1-х)
