0.17. Упростите выражение: 1) (х-2)(х+3)+(x-3)(х + 2); 2) (у-1)(y+ 2) +(y+1)(у — 2): 3) (a+1)(а+ 2) + (a+3)(а+4); 4) (с -1)(c— 2) + (с - 3)(c-4).​
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