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b)1/5^-4·5^-9÷5^-4=5^4·5^-9÷5^-4=5^-5÷5^-4=5^-1
2a)2^4·2^10=2^14
b)1/4^4÷2^-6·2^4=4^-4÷2^-6·2^4=2^-8÷2^-6·2^4=2^-2·2^4=2^2
b) = : ^-1
2. ( * = * =
b) = : * = : * = * =