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2*8^40=2*(2^3)^40=2*2^120=2^121
b)
25^40/5^-10 = (5^2)^40/5^-10=5^80/5^-10=5^90
c)
4^15*8^9/2*16^7*4^-8=(2^2)^15*(2^3)^9/2*(2^4)^7*(2^2)^-8=
=2^30*2^27/2*2^28*2^-16=2^57/2*2^12=2^45/2=2^45*2^-1=2^44