Номера 225(2) и 226(3)

Question

Номера 225(2) и 226(3)

---

Answer 1

Решения на фотографиях.

---

---

Answer 2

2)5х(х-3)²-5(х-1)³+15(х+2)(х-2)= 5х(х²-6х+9)-5(х³-3х²+3х-1)+15(х²-4)=5х³-30х²+45х-5х³+15х²+15х+5+15х²-60=60х-55;