问题标题:
先化简再求值:-1/2a^2b-[32a^2b-3(abc-13a^2c)-4a^2c]-3abc,其中a=-1,b=-3c=1
问题描述:
先化简再求值:-1/2a^2b-[32a^2b-3(abc-13a^2c)-4a^2c]-3abc,其中a=-1,b=-3c=1
崔德刚回答:
-1/2a^2b-[32a^2b-3(abc-13a^2c)-4a^2c]-3abc
=-1/2a^2b-32a^2b+3abc-a^2c+4a^2c-3abc
=-2a^2b+3a^2c
=-2×1×1+3×1×(-1/3)
=-2-1
=-3
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