4(a+b)²-9(a+3)(a-3)+5(a-1)²,其中a=-1应该是4(a+2)²-9(a+3)(a-3)+5(a-1)²,其中a=-1
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![4(a+b)²-9(a+3)(a-3)+5(a-1)²,其中a=-1应该是4(a+2)²-9(a+3)(a-3)+5(a-1)²,其中a=-1](/uploads/image/z/753976-64-6.jpg?t=4%28a%2Bb%29%26%23178%3B-9%28a%2B3%29%28a-3%29%2B5%28a-1%29%26%23178%3B%2C%E5%85%B6%E4%B8%ADa%3D-1%E5%BA%94%E8%AF%A5%E6%98%AF4%28a%2B2%29%26%23178%3B-9%28a%2B3%29%28a-3%29%2B5%28a-1%29%26%23178%3B%2C%E5%85%B6%E4%B8%ADa%3D-1)
4(a+b)²-9(a+3)(a-3)+5(a-1)²,其中a=-1应该是4(a+2)²-9(a+3)(a-3)+5(a-1)²,其中a=-1
4(a+b)²-9(a+3)(a-3)+5(a-1)²,其中a=-1
应该是4(a+2)²-9(a+3)(a-3)+5(a-1)²,其中a=-1
4(a+b)²-9(a+3)(a-3)+5(a-1)²,其中a=-1应该是4(a+2)²-9(a+3)(a-3)+5(a-1)²,其中a=-1
第一个a+b错了
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