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Calculati : a) 5^23:5^21+2^6×2^4-(2^2)^5. b)5^4×3^4-15^2^2

Răspuns :

a)5^23÷5^21+2^6×2^4-(2^2)^5
=5^2+2^10-2^10
=5^2=25
b)5^4×3^4-15^2^2
=(5×3)^4 -15^4
=15^4-15^4
=0