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1.a) 5+5×(-5^25)+(5²)^13-(2×3²-4)=
b)[(-5)²×(-3+8)^4×(-2-3)^5)]^7:(-5)^75=
2 Calculati: a=3×[(-1)^n-5×(-1)^2n]+(-1)^n²+³
^ inseamna la puterea


Răspuns :

a=3×[(-1)ⁿ-5×(-1)²ⁿ]+(-1)ⁿ^⁵=
n=par   ⇒ 2n =par    n⁵=par
a=3×(1-5×1)+1=3×(1-5)+1=3×(-4)+1=12+1=-11

n impar   ⇒ 2n =par    n⁵=impar
a=3×(-1-5×1)-1=3×(-1-5)-1=3×(-6)-1=-18-1=-19