1、2(2a2+9b)+3(-5a2-4b) 2、a+(5a-3b)-(a-2b) 3、3n-[5n+(3n-1)] 4、a-(5a-3b)+(2b-a) 1、(3a2 +7bc-4b2)-(5a2-3bc-2b2)+abc,其中a=5,b=1/3,c=3 2、(5a2-3b2)+[(a2+b2)-(5a2+3b2)],其中a=-1,
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![1、2(2a2+9b)+3(-5a2-4b) 2、a+(5a-3b)-(a-2b) 3、3n-[5n+(3n-1)] 4、a-(5a-3b)+(2b-a) 1、(3a2 +7bc-4b2)-(5a2-3bc-2b2)+abc,其中a=5,b=1/3,c=3 2、(5a2-3b2)+[(a2+b2)-(5a2+3b2)],其中a=-1,](/uploads/image/z/965611-19-1.jpg?t=1%E3%80%812%282a2%EF%BC%8B9b%29%EF%BC%8B3%28%EF%BC%8D5a2%EF%BC%8D4b%29+2%E3%80%81a%EF%BC%8B%285a%EF%BC%8D3b%29%EF%BC%8D%28a%EF%BC%8D2b%29+3%E3%80%813n%EF%BC%8D%5B5n%EF%BC%8B%283n%EF%BC%8D1%29%5D+4%E3%80%81a%EF%BC%8D%285a%EF%BC%8D3b%29%EF%BC%8B%282b%EF%BC%8Da%29+1%E3%80%81%283a2+%EF%BC%8B7bc%EF%BC%8D4b2%29%EF%BC%8D%285a2%EF%BC%8D3bc%EF%BC%8D2b2%29%EF%BC%8Babc%2C%E5%85%B6%E4%B8%ADa%EF%BC%9D5%2Cb%EF%BC%9D1%2F3%2Cc%EF%BC%9D3+2%E3%80%81%285a2%EF%BC%8D3b2%29%EF%BC%8B%5B%28a2%EF%BC%8Bb2%29%EF%BC%8D%285a2%EF%BC%8B3b2%29%5D%2C%E5%85%B6%E4%B8%ADa%EF%BC%9D%EF%BC%8D1%2C)
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