Ответ:

1.(x^5-3y²)(x^10+3y²x^5+9y⁴)=x^125-27y^6

2.(5c^6+3y^4)(25c^12-15c^6y^4+9y^8)=125c^18+27y^12

3.(10c^5-4a²b³)(100c^10+40c^5a²b³+16a⁴b^6)=1000c^15-64a^6b^9

4.(0,2x⁴-2y³z^10)(0,04x^8+0,4x⁴y³z^10+4y^6z^20)=0,008x^8-6y^9z^30

5.(c^6+5b^9d^11)(c^12-5b^9d^11c^6+25b^18d^22) =c^18+125b^27d^33