原式 = -1 - { -8 - [ 3 - 0.4 *(3/2) ] /(-2)} = -1 - { -8 + (3 - 0.6) / 2 } = -1 - ( -8 - 1.2) = -1 + 9.2 = 8.2
=-1-[（-8-（3-0.6）/（-2）]
