(x + 1)(x + 2); (a + b)(a + b);
(a - 2)(3 - a);
(a - b)(a - b);
(3x + 2y)(3x + 2y).



Можно поэалуйста с обяснением типо:
(x + 1)(x + 2)=x°+2x+x+2= x°+3x+2

°=2
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