9(a-b)²+12(a²-b²)+4(a+b)²a³-10a²+25ax²+2x+1-y²25(m+n-3)²-9(3m-2n)²
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![9(a-b)²+12(a²-b²)+4(a+b)²a³-10a²+25ax²+2x+1-y²25(m+n-3)²-9(3m-2n)²](/uploads/image/z/1719144-0-4.jpg?t=9%28a-b%29%26%23178%3B%2B12%28a%26%23178%3B-b%26%23178%3B%29%2B4%28a%2Bb%29%26%23178%3Ba%26%23179%3B-10a%26%23178%3B%2B25ax%26%23178%3B%2B2x%2B1-y%26%23178%3B25%EF%BC%88m%2Bn-3%EF%BC%89%26%23178%3B-9%EF%BC%883m-2n%EF%BC%89%26%23178%3B)
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9(a-b)²+12(a²-b²)+4(a+b)²a³-10a²+25ax²+2x+1-y²25(m+n-3)²-9(3m-2n)²
9(a-b)²+12(a²-b²)+4(a+b)²
a³-10a²+25a
x²+2x+1-y²
25(m+n-3)²-9(3m-2n)²
9(a-b)²+12(a²-b²)+4(a+b)²a³-10a²+25ax²+2x+1-y²25(m+n-3)²-9(3m-2n)²
9(a-b)²+12(a²-b²)+4(a+b)²
=(3(a-b))+2*3*2(a+b)(a-b)+(2(a+b))²
=(3(a-b)+2(a+b))²
=(5a-b)²
a³-10a²+25a
=a(a²-2*5*a+5²)
=a(a-5)²
x²+2x+1-y²
=(x+1)²-y²
=(x+1+y)(x+1-y)
25(m+n-3)²-9(3m-2n)²
=(5(m+n-3))²-(3(3m-2n))²
=(5(m+n-3)+3(3m-2n))(5(m+n-3)-3(3m-2n))
=(14m-n-15)(-4m+11n-15)
1原式=【3(a-b)+2(a+b)】²
=(5a-b)²
2原式=a(a²-10a+25)
=a(a-5)²
3原式=(x+1)²-y²
=(x+1+y)(x+1-y)
4原式=【5(m+n-3)+3(3m-2n)】【5(m+n-3)-3(3m-2n)】
=(14m-n-15)(11n-4m-15)