1) 1. x^9x^2=x^11 2. aa^7=a^8 3.b^3b^3=b^6 4.7^11 7^3=7^14 5.m^4m^5m^11=m^20 6.c^19cc^3=c^23 7.(a+b)(a+b)^7=(a+b)(a^7+b^7)=a^8+b^8 8.n^9n^4nn^3=^17 9.(y-1)^5(y-1)^4=(y^5-1)(y^4-1)=y^9-1
2) 1.a^23/a^17=a^6 2.b^7/b=b^6 3.(a-b)^15/(a-b)^11=(a^15-b^15)/(a^11-b^11)=a^4-b^4