Salut!
15-1+3+[(4+6⁵÷6³+2)÷7+2²] =
15-1+3+[(4+6²+2)÷7+2²] =
15-1+3+[(4+36+2)÷7+2²] =
15-1+3+[(40+2)÷7+2²] =
15-1+3+(42÷7+4) =
15-1+3+(6+4) =
15-1+3+10 =
14+3+10 =
17+10 =
27
[3⁴÷(5²-2⁴)+12÷6-(2⁵+3)÷7]×2² =
[3⁴÷(25-16)+12÷6-(2⁵+3)÷7]×2² =
[3⁴÷9+12÷6-(32+3)÷7]×2² =
(3⁴÷9+12÷6-35÷7)×2² =
(81÷9+12÷6-35÷7)×2² =
(9+2-5)×2² =
(11-5)×2² =
6×2² =
6×4 =
24
