b=3^46:[9^22+3^20×27^8+9^30:81^4]-2^23:(2^22+2^22)
b=3^46:[(3^2)^22+3^20×(3^3)^8+(3^2)^30:(3^4)^4] - 2^23 : 2^22 - 2^23 : 2^22
b = 3^46:(3^44+3^20×3^24+3^60:3^16)-2^1 - 2^1
b = 3^46: (3^44+3^44+3^44) - 4
b = 3^46 : 3×3^44 - 4
b = 3 × 3^2 - 4
b = 3 × 9 - 4
b = 27 - 4
b = 23