(1) Simplify: (3^10÷3^7)×3-^5
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simplify (3^-7 / 3^-10) x 3^-5
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a^m÷a^n= a^m-n
3¹⁰÷3⁷= 3^10-7
= 3³
a^m×a^n=a^m+n
3³×3^-5=3^3-(-5)
= 3^3+5
= 3⁸
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