а^n*a^m=a^(n+m)
a^n:a^m=a^(n-m)
1)(a^12:a^7)*a^2=(a^(12-7))*a^2=a^5*a^2=a^(5+2)=a^7
2)
(x^5*x^7):x^8=x^12:x^8=x^4
3)
b^12:(b^4*b^3)=b^12:b^7=b^5
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Answers & Comments
а^n*a^m=a^(n+m)
a^n:a^m=a^(n-m)
1)(a^12:a^7)*a^2=(a^(12-7))*a^2=a^5*a^2=a^(5+2)=a^7
2)
(x^5*x^7):x^8=x^12:x^8=x^4
3)
b^12:(b^4*b^3)=b^12:b^7=b^5