问几个题 1,(x+2y)(x-2y)(x^2-4y^2)=?1,(x+2y)(x-2y)(x^2-4y^2)=?2,(3a-4b)^2 (-4b-3a)^2=?3,设(5a+3b)^2=(5a-3b) ^2+A,则A是————?第三题怎么一个30ab一个60ab?还有怎么答案不统一?
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![问几个题 1,(x+2y)(x-2y)(x^2-4y^2)=?1,(x+2y)(x-2y)(x^2-4y^2)=?2,(3a-4b)^2 (-4b-3a)^2=?3,设(5a+3b)^2=(5a-3b) ^2+A,则A是————?第三题怎么一个30ab一个60ab?还有怎么答案不统一?](/uploads/image/z/1614812-68-2.jpg?t=%E9%97%AE%E5%87%A0%E4%B8%AA%E9%A2%98+1%2C%28x%2B2y%29%28x-2y%29%28x%5E2-4y%5E2%29%3D%3F1%2C%28x%2B2y%29%28x-2y%29%28x%5E2-4y%5E2%29%3D%3F2%2C%EF%BC%883a-4b%EF%BC%89%5E2+%EF%BC%88-4b-3a%EF%BC%89%5E2%3D%3F3%2C%E8%AE%BE%EF%BC%885a%2B3b%EF%BC%89%5E2%3D%285a-3b%29+%5E2%2BA%2C%E5%88%99A%E6%98%AF%E2%80%94%E2%80%94%E2%80%94%E2%80%94%3F%E7%AC%AC%E4%B8%89%E9%A2%98%E6%80%8E%E4%B9%88%E4%B8%80%E4%B8%AA30ab%E4%B8%80%E4%B8%AA60ab%EF%BC%9F%E8%BF%98%E6%9C%89%E6%80%8E%E4%B9%88%E7%AD%94%E6%A1%88%E4%B8%8D%E7%BB%9F%E4%B8%80%EF%BC%9F)
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问几个题 1,(x+2y)(x-2y)(x^2-4y^2)=?1,(x+2y)(x-2y)(x^2-4y^2)=?2,(3a-4b)^2 (-4b-3a)^2=?3,设(5a+3b)^2=(5a-3b) ^2+A,则A是————?第三题怎么一个30ab一个60ab?还有怎么答案不统一?
问几个题 1,(x+2y)(x-2y)(x^2-4y^2)=?
1,(x+2y)(x-2y)(x^2-4y^2)=?
2,(3a-4b)^2 (-4b-3a)^2=?
3,设(5a+3b)^2=(5a-3b) ^2+A,则A是————?
第三题怎么一个30ab一个60ab?
还有怎么答案不统一?
问几个题 1,(x+2y)(x-2y)(x^2-4y^2)=?1,(x+2y)(x-2y)(x^2-4y^2)=?2,(3a-4b)^2 (-4b-3a)^2=?3,设(5a+3b)^2=(5a-3b) ^2+A,则A是————?第三题怎么一个30ab一个60ab?还有怎么答案不统一?
1,(x+2y)(x-2y)(x^2-4y^2)=(x²-4y²)(x²-4y²)=(x²-4y²)²
2,(3a-4b)^2 (-4b-3a)^2=(3a-4b)²(3a+4b)²=(9a²-16b²)²
3,设(5a+3b)^2=(5a-3b) ^2+A,
即25a²+30ab+9b²=25a²-30ab+9b²+A
所以A=60ab