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Simplify:
(a)`b^2×x^2×b^11`
(b)`b^3×n^2×b^0×n^3`
(c)`a^5×c^2×a^3×b^3×a^4`
(d)`a^(-2)×b^2×a^(-8)×b^(-4)`
(e)`x^2 y^2× x^2 y^5× x^(-3) y^(-9)`
(f)`(xyt)^n÷(xyt)^2`
(g) `(a^x×a^2x)/(a^x×a^x×a^x )`