4x^4y²-5x²y²-9y²用十字相乘法分解因式用十字相乘法分解因式1.4x^4y²-5x²y²-9y²2.2(a-b)²-(a-b)-33.4(2x+y)²-8(2x+y)²-8(2x+y)+34.7x^4+5x²y²-2y^45.5x
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![4x^4y²-5x²y²-9y²用十字相乘法分解因式用十字相乘法分解因式1.4x^4y²-5x²y²-9y²2.2(a-b)²-(a-b)-33.4(2x+y)²-8(2x+y)²-8(2x+y)+34.7x^4+5x²y²-2y^45.5x](/uploads/image/z/4313939-59-9.jpg?t=4x%5E4y%26%23178%3B-5x%26%23178%3By%26%23178%3B-9y%26%23178%3B%E7%94%A8%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%E7%94%A8%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F1.4x%5E4y%26%23178%3B-5x%26%23178%3By%26%23178%3B-9y%26%23178%3B2.2%EF%BC%88a-b%EF%BC%89%26%23178%3B-%EF%BC%88a-b%EF%BC%89-33.4%EF%BC%882x%2By%EF%BC%89%26%23178%3B-8%EF%BC%882x%2By%EF%BC%89%26%23178%3B-8%EF%BC%882x%2By%EF%BC%89%2B34.7x%5E4%2B5x%26%23178%3By%26%23178%3B-2y%5E45.5x%26%2317)
4x^4y²-5x²y²-9y²用十字相乘法分解因式用十字相乘法分解因式1.4x^4y²-5x²y²-9y²2.2(a-b)²-(a-b)-33.4(2x+y)²-8(2x+y)²-8(2x+y)+34.7x^4+5x²y²-2y^45.5x
4x^4y²-5x²y²-9y²用十字相乘法分解因式
用十字相乘法分解因式
1.4x^4y²-5x²y²-9y²
2.2(a-b)²-(a-b)-3
3.4(2x+y)²-8(2x+y)²-8(2x+y)+3
4.7x^4+5x²y²-2y^4
5.5x³y-7x²y-6xy
4x^4y²-5x²y²-9y²用十字相乘法分解因式用十字相乘法分解因式1.4x^4y²-5x²y²-9y²2.2(a-b)²-(a-b)-33.4(2x+y)²-8(2x+y)²-8(2x+y)+34.7x^4+5x²y²-2y^45.5x
1.4x^4y²-5x²y²-9y²
=y²(4x^4-5x²-9)
=y²(4x²-9)(x²+1)
=y²(x²+1)(2x+3)(2x-3)
2.2(a-b)²-(a-b)-3
=[2(a-b)-3][(a-b)+1]
=(2a-2b-3)(a-b+1)
3.4(2x+y)²-8(2x+y)+3
=[2(2x+y)-1][2(2x+y)-3]
=(4x+2y-1)(4x+2y-3)
]
4.7x^4+5x²y²-2y^4
=(x²+y²)(7x²-2y²)
5.5x³y-7x²y-6xy
=xy(5x²-7x-6)
=xy(5x+3)(x-2)
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