1)(3a+b)²-(a+3b)²2)x²y+12xy-36y
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![1)(3a+b)²-(a+3b)²2)x²y+12xy-36y](/uploads/image/z/7110088-16-8.jpg?t=1%EF%BC%89%EF%BC%883a%2Bb%29%26%23178%3B-%28a%2B3b%29%26%23178%3B2%EF%BC%89x%26%23178%3By%2B12xy-36y)
1)(3a+b)²-(a+3b)²2)x²y+12xy-36y
1)(3a+b)²-(a+3b)²
2)x²y+12xy-36y
1)(3a+b)²-(a+3b)²2)x²y+12xy-36y
1) 2(2a+2b)(a-b)
2) y(x+6)²-72y
平方怎么打上去的?
(1)(3a+b+a+3b)(3a+b-a-3b)=(4a+4b)(2a-2b)
(2)y(x²+12x-36)=y(x-6)²