Question

Va roggg 2 a si b!!!!

Answer 1

a)20^2-15×(10^2-9^2)
=400-15×(100-81)
=400-15×19
=400-285
=115
b)[4×(15-2^2×3)+3^2]^3÷(2^2^2+2^2+2^0)
=[4×(15-4×3)+9]^3÷(2^4+1+4)
=[4×(15-12)+9]^3÷(16+4+1)
=(4×3+9)^3÷21
=(12+9)^3÷21
=21^3÷21
=21^2
=441
P.S. ^=la putere