3 4 2 = -1 -2 2 = =8-4=4<br>3 4 2 = 0 -2 -10 = =26-70=-54<br>2 3 1 = 0 -1 -7 = =13-49=-36<br>2 3 1 = 0 -1 -5 = =7-10=3<br>所以行列式=3×4-4×(-54)-36-2×3=186<br>1年前