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b)5^-6 *5^-9=5^-15
c)(-0,5)^-2 *(-0,5)^-2= (-0,5)^-4
d)5^-4 *5^-3*5^-2=5^-9
e)b^-3 *b^-4*b^-6=b^-13
f)c^-3 *c^-4 *c^-5=c^-12