16-3×{[21-2×(36-27)÷3]÷(32-29)-1}= 16-3x{[21-2x9:3]:3-1} = 16-3x{[21-18:3]:3-1} = 16-3x{(21-6):3-1} = 16-3x(15:3-1) = 16-3x4 = 16-12 = 4
45-36÷{90÷(8-5)-8×[3×13-9×(72-68)]} = 45-36÷{90÷3-8×[3×13-9×4]} =
= 45-36÷{90÷3-8×(39-36)} = 45-36÷{90÷3-8x3) = 45-36÷(30-24) =
= 45-36÷6 = 45-6 = 39