⑴ (2a+b)²–(a–b)² ;(2) (x+y)²-10(x+y)+25(3) 4a²–3b(4a–3b)4、 18a²c-8b²c5、m4 - 81n46、x²y²-4xy+4解方程:x³-9x=0
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![⑴ (2a+b)²–(a–b)² ;(2) (x+y)²-10(x+y)+25(3) 4a²–3b(4a–3b)4、 18a²c-8b²c5、m4 - 81n46、x²y²-4xy+4解方程:x³-9x=0](/uploads/image/z/8322551-71-1.jpg?t=%E2%91%B4+%282a%2Bb%29%26%23178%3B%E2%80%93%28a%E2%80%93b%29%26%23178%3B+%EF%BC%9B%282%29+%28x%2By%29%26%23178%3B-10%28x%2By%29%2B25%283%29+4a%26%23178%3B%E2%80%933b%284a%E2%80%933b%294%E3%80%81+18a%26%23178%3Bc-8b%26%23178%3Bc5%E3%80%81m4+-+81n46%E3%80%81x%26%23178%3By%26%23178%3B-4xy%2B4%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9Ax%26%23179%3B-9x%3D0)
⑴ (2a+b)²–(a–b)² ;(2) (x+y)²-10(x+y)+25(3) 4a²–3b(4a–3b)4、 18a²c-8b²c5、m4 - 81n46、x²y²-4xy+4解方程:x³-9x=0
⑴ (2a+b)²–(a–b)² ;
(2) (x+y)²-10(x+y)+25
(3) 4a²–3b(4a–3b)
4、 18a²c-8b²c
5、m4 - 81n4
6、x²y²-4xy+4
解方程:x³-9x=0
⑴ (2a+b)²–(a–b)² ;(2) (x+y)²-10(x+y)+25(3) 4a²–3b(4a–3b)4、 18a²c-8b²c5、m4 - 81n46、x²y²-4xy+4解方程:x³-9x=0
(1) (2a+b+a-b)(2a+b-a+b)=3a(a+2b)
(2) (x+y-5)^2
(3) (2a-3b)^2
(4) 2c(3a+2b)(3a-2b)
(5) (m^2+9n^2)(m^2-9n^2)=(m^2+9n^)(m+3n)(m-3n)
(6) (xy-2)^2
解方程:x³-9x=0
因为 x(x+3)(x-3)=0
所以 x1=0,x2=-3,x3=3
1.3a[a=2b]2.