Đáp án:
b) B = 2³.4² + 3².3² - 40
= 2³.(2²)² + 3²†² - 40
= 2³.2⁴ + 3⁴ - 40
= $2^{3+4}$ + 3⁴ - 40
= 2⁷ + 3⁴ - 40
= 128 + 81 - 40
= 209 - 40
= 169
=13²
c, C=11.$2^{4}$ + $6^{2}$. 19 + 40
=11.16 + 36.19 + 40
=176 + 684 + 40
=900
= 30²
d, D = 4³ + 6³ +7³ +2
=64 + 216 + 343+2
=625
=25²