9(a-b)^2—(a+b)^2 =(3a-3b)^2-(a+b)^2 =(3a-3b+a+b)(3a-3b-a+b) =(4a-2b)(2a-2b) =2(2a-b)(a-b) 对不对对不对?错在哪?
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![9(a-b)^2—(a+b)^2 =(3a-3b)^2-(a+b)^2 =(3a-3b+a+b)(3a-3b-a+b) =(4a-2b)(2a-2b) =2(2a-b)(a-b) 对不对对不对?错在哪?](/uploads/image/z/7009595-35-5.jpg?t=9%28a-b%29%5E2%E2%80%94%28a%2Bb%29%5E2+%3D%283a-3b%29%5E2-%28a%2Bb%29%5E2+%3D%283a-3b%2Ba%2Bb%29%283a-3b-a%2Bb%29+%3D%284a-2b%29%282a-2b%29+%3D2%282a-b%29%28a-b%29+%E5%AF%B9%E4%B8%8D%E5%AF%B9%E5%AF%B9%E4%B8%8D%E5%AF%B9%3F%E9%94%99%E5%9C%A8%E5%93%AA%3F)
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9(a-b)^2—(a+b)^2 =(3a-3b)^2-(a+b)^2 =(3a-3b+a+b)(3a-3b-a+b) =(4a-2b)(2a-2b) =2(2a-b)(a-b) 对不对对不对?错在哪?
9(a-b)^2—(a+b)^2 =(3a-3b)^2-(a+b)^2 =(3a-3b+a+b)(3a-3b-a+b) =(4a-2b)(2a-2b) =2(2a-b)(a-b) 对不对
对不对?错在哪?
9(a-b)^2—(a+b)^2 =(3a-3b)^2-(a+b)^2 =(3a-3b+a+b)(3a-3b-a+b) =(4a-2b)(2a-2b) =2(2a-b)(a-b) 对不对对不对?错在哪?
=(3a-3b+a+b)(3a-3b-a+b)
这里错了
=(3a-3b+a+b)(3a-3b-a- b) = (4a-2b)(2a-4b)