题目内容
因式分解
(1)(a﹣3)2+(3﹣a)
(2)﹣4a2+24a﹣36
(3)16x2﹣64
(4)9m2﹣n2+3m﹣n.
(1)(a﹣3)2+(3﹣a)
(2)﹣4a2+24a﹣36
(3)16x2﹣64
(4)9m2﹣n2+3m﹣n.
解:(1)(a﹣3)2+(3﹣a)
=(a﹣3)(a﹣3﹣1)
=(a﹣3)(a﹣4);
(2)﹣4a2+24a﹣36
=﹣4(a2﹣6a+9)
=﹣4(a﹣3)2;
(3)16x2﹣64
=16(x2﹣4)
=16(x+2)(x﹣2);
(4)9m2﹣n2+3m﹣n
=(3m+n)(3m﹣n)+(3m﹣n)
=(3m+n+1)(3m﹣n).
=(a﹣3)(a﹣3﹣1)
=(a﹣3)(a﹣4);
(2)﹣4a2+24a﹣36
=﹣4(a2﹣6a+9)
=﹣4(a﹣3)2;
(3)16x2﹣64
=16(x2﹣4)
=16(x+2)(x﹣2);
(4)9m2﹣n2+3m﹣n
=(3m+n)(3m﹣n)+(3m﹣n)
=(3m+n+1)(3m﹣n).
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