please find the answer quick it's urgent
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1) 8^5×8^-6
8^5+(-6)
8^-1
1/8
2) (5/4)^7×(5/4)^3
(5/4)^7+3
(5/4)^10
3) (18/3)^20×(18/3)^-15
(18/3)^20+(-15)
(18/3)^5
4)
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