3^21×5^21-15^21=(3×5)^21-15^21=15^21-15^21=0
3^20×2^20-6^23:6^3=(3×2)^20-6^20=6^20-6^20=0
2^18×12^18:(6^16×4^16)=(2×12)^18:24^16=24^18:24^16=24^2=576
75^38:25^38-(3^19)^2=(75:25)^38-3^38=3^38-3^38=0
26^27:13^27:2^5^2=(26:13)^27:2^25=2^27:2^25=2^2=4
10^64:2^64-5^4^3=(10:2)^64-5^64=5^64-5^64=0
Sper ca te-am ajutat!!!