2a^2b-[3a^2b-(3a^2c-a^2b)-2a^2c,其中a=1,b=2,c=-1/2
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2a^2b-[3a^2b-(3a^2c-a^2b)-2a^2c,其中a=1,b=2,c=-1/2
![2a^2b-[3a^2b-(3a^2c-a^2b)-2a^2c,其中a=1,b=2,c=-1/2](/uploads/image/z/19443506-50-6.jpg?t=2a%5E2b-%5B3a%5E2b-%283a%5E2c-a%5E2b%29-2a%5E2c%2C%E5%85%B6%E4%B8%ADa%3D1%2Cb%3D2%2Cc%3D-1%2F2)
2a^2b-[3a^2b-(3a^2c-a^2b)-2a^2c]
=2a^2b-3a^2b+(3a^2c-a^2b)+2a^2c
=-a^2b+3a^2c-a^2b+2a^2c
=-2a^2b+5a^2c
=-4-5/2
=-13/2
=2a^2b-3a^2b+(3a^2c-a^2b)+2a^2c
=-a^2b+3a^2c-a^2b+2a^2c
=-2a^2b+5a^2c
=-4-5/2
=-13/2
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