一:-1/2a^2b-[3/2a^2b-3(abc-1/3a^2c)-4a^2c]-3abc 已知:a=-1 b=-3 c=1二:2 (2a - b) - 3 (a + b) - 8 (2a - b +1)
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![一:-1/2a^2b-[3/2a^2b-3(abc-1/3a^2c)-4a^2c]-3abc 已知:a=-1 b=-3 c=1二:2 (2a - b) - 3 (a + b) - 8 (2a - b +1)](/uploads/image/z/5369343-15-3.jpg?t=%E4%B8%80%EF%BC%9A-1%2F2a%5E2b-%5B3%2F2a%5E2b-3%28abc-1%2F3a%5E2c%29-4a%5E2c%5D-3abc+%E5%B7%B2%E7%9F%A5%EF%BC%9Aa%3D-1+b%3D-3+c%3D1%E4%BA%8C%EF%BC%9A2+%282a+-+b%29+-+3+%28a+%2B+b%29+-+8+%282a+-+b+%2B1%29)
一:-1/2a^2b-[3/2a^2b-3(abc-1/3a^2c)-4a^2c]-3abc 已知:a=-1 b=-3 c=1二:2 (2a - b) - 3 (a + b) - 8 (2a - b +1)
一:-1/2a^2b-[3/2a^2b-3(abc-1/3a^2c)-4a^2c]-3abc
已知:a=-1 b=-3 c=1
二:2 (2a - b) - 3 (a + b) - 8 (2a - b +1)
一:-1/2a^2b-[3/2a^2b-3(abc-1/3a^2c)-4a^2c]-3abc 已知:a=-1 b=-3 c=1二:2 (2a - b) - 3 (a + b) - 8 (2a - b +1)
第一题6+9-1/3+4-9=29/3
第二题-15a-13b+8
要干嘛
这么简单都不会!哈哈!