公式法因式分解(-7+2m²)(-7-2m²) m(a-3)-n(3-a)(x-2y)(x+2y)-(x+2y)²+8y²(a+2b+3c)(a+2b-3c)
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![公式法因式分解(-7+2m²)(-7-2m²) m(a-3)-n(3-a)(x-2y)(x+2y)-(x+2y)²+8y²(a+2b+3c)(a+2b-3c)](/uploads/image/z/240337-1-7.jpg?t=%E5%85%AC%E5%BC%8F%E6%B3%95%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%28-7%2B2m%26%23178%3B%29%28-7-2m%26%23178%3B%29+m%28a-3%29-n%283-a%29%28x-2y%29%28x%2B2y%29-%28x%2B2y%29%26%23178%3B%2B8y%26%23178%3B%EF%BC%88a%2B2b%2B3c%EF%BC%89%EF%BC%88a%2B2b-3c%EF%BC%89)
公式法因式分解(-7+2m²)(-7-2m²) m(a-3)-n(3-a)(x-2y)(x+2y)-(x+2y)²+8y²(a+2b+3c)(a+2b-3c)
公式法因式分解
(-7+2m²)(-7-2m²)
m(a-3)-n(3-a)
(x-2y)(x+2y)-(x+2y)²+8y²
(a+2b+3c)(a+2b-3c)
公式法因式分解(-7+2m²)(-7-2m²) m(a-3)-n(3-a)(x-2y)(x+2y)-(x+2y)²+8y²(a+2b+3c)(a+2b-3c)
这些题目有的象因式分解,有的象计算
(-7+2m²)(-7-2m²)
=(-7)²-(2m²)²
=49-4m的4次方 这是计算
m(a-3)-n(3-a)
=m(a-3)+n(a-3)
=(a-3)(m+n) 这是因式分解
m(a-3)-n(3-a)
=ma-3m-3n+na 这是计算
(x-2y)(x+2y)-(x+2y)²+8y²
=x²-4y²-x²-4xy-4y²+8y²
=-4xy
(a+2b+3c)(a+2b-3c)
=(a+2b)²-(3c)²
=a²+4ab+4b²-9c²
(-7+2m²)(-7-2m²)
=(7-2m²)(7+2m²)
=(√7+√2m)(√7-√2m)(7+2m²)
m(a-3)-n(3-a)
=(a-3)(m+n)
(x-2y)(x+2y)-(x+2y)²+8y²
=x²-4y²-x²-4xy-4y²+8y²
=-4xy
(a+2b+3c)(a+2b-3c)
= (a+2b+3c)(a+2b-3c) (无需继续分解)