几道因式分解题,我做完了,和同学对答案都不一样.4(2p+3q)²-(3p+q)²
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几道因式分解题,我做完了,和同学对答案都不一样.4(2p+3q)²-(3p+q)²
(5x-3y)²-(3x-5y)² 169(a-b)²-196(a+b)²
a²(a-b)+b²(b-a)
(5x-3y)²-(3x-5y)² 169(a-b)²-196(a+b)²
a²(a-b)+b²(b-a)
![几道因式分解题,我做完了,和同学对答案都不一样.4(2p+3q)²-(3p+q)²](/uploads/image/z/14050177-25-7.jpg?t=%E5%87%A0%E9%81%93%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E9%A2%98%2C%E6%88%91%E5%81%9A%E5%AE%8C%E4%BA%86%2C%E5%92%8C%E5%90%8C%E5%AD%A6%E5%AF%B9%E7%AD%94%E6%A1%88%E9%83%BD%E4%B8%8D%E4%B8%80%E6%A0%B7.4%EF%BC%882p%2B3q%EF%BC%89%26%23178%3B-%EF%BC%883p%2Bq%EF%BC%89%26%23178%3B)
4(2p+3q)²-(3p+q)²=(4p+6q+3p+q)(4p+6q-3p-q)=7(p+q)(p+5q)
(5x-3y)²-(3x-5y)² =(5x-3y+3x-5y)(5x-3y-3x+5y)=(8x-8y)(2x+2y)=16(x-y)(x+y)
169(a-b)²-196(a+b)²=(13a-13b+14a+14b)(13a-13b-14a-14b)=-(27a+b)(27b+a)
a²(a-b)+b²(b-a)=(a²-b²)(a-b)=(a+b)(a-b)²
再问: (8x-8y)(2x+2y)=16(x-y)(x+y)我有点没看明白
再答: (8x-8y)(2x+2y)=8(x-y)*2(x+y)=16(x-y)(x+y)
(5x-3y)²-(3x-5y)² =(5x-3y+3x-5y)(5x-3y-3x+5y)=(8x-8y)(2x+2y)=16(x-y)(x+y)
169(a-b)²-196(a+b)²=(13a-13b+14a+14b)(13a-13b-14a-14b)=-(27a+b)(27b+a)
a²(a-b)+b²(b-a)=(a²-b²)(a-b)=(a+b)(a-b)²
再问: (8x-8y)(2x+2y)=16(x-y)(x+y)我有点没看明白
再答: (8x-8y)(2x+2y)=8(x-y)*2(x+y)=16(x-y)(x+y)
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