1) (a+2)(a^2-2a+4)
2) (c-4)(c^2+4c+16)
3) (5-b)(25+5b+25)
4)(1+x)(1-x+x^2)
5)(a+10)(a^2-10a+100)
6)(3a-1)(9a^2+3a+1)
7)(10c-6)(100c^2+60c+36)
8)(ab-1)(a^2b^2+ab+1)
9)(mn+0,1)(m^2n^2-0,1mn+0,01)
10)(4/7m-5/6n)(16/49m^2+4/7×5/6mn+25/36n^2)=(4/7m-5/6n)(16/49m^2+10/21mn+25/36n^2)
11)(2m^2+3n^3)(4m^4-6m^2n^3+9n^6)
12)(m^2n-p^4)(m^4n^2+m^2np^4+p^8)
13)(0,3x^7+0,5y^8)(0,09x^14-0,15x^7y^8+0,25y^16)
14)(0,6-2c^9)(0,36+1,2c^9+4c^18)
15)(10a^4b+0,1c^2d^5)(100a^8b^2-a^4bc^2d^5+0,01c^4d^10)