Question

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Answer 1

Step-by-step explanation:

bases are equal power should be added

Answer 2

(2/5)^3×(2/5)^-6=(2/5)^2a-1

when bases are same we equate the power

3+(-6)=2a-1

-3=2a-1

-3+1=2a

-2=2a

a=-2/2

a=-1