问题
计算题
对下列代数式分解因式:
(1)n2(m﹣2)﹣n(2﹣m);
(2)(x﹣1)(x﹣3)+1.
答案
解:(1)n2(m﹣2)﹣n(2﹣m),
=n2(m﹣2)+n(m﹣2),
=n(m﹣2)(n+1);
(2)(x﹣1)(x﹣3)+1,
=x2﹣4x+4,
=(x﹣2)2.
对下列代数式分解因式:
(1)n2(m﹣2)﹣n(2﹣m);
(2)(x﹣1)(x﹣3)+1.
解:(1)n2(m﹣2)﹣n(2﹣m),
=n2(m﹣2)+n(m﹣2),
=n(m﹣2)(n+1);
(2)(x﹣1)(x﹣3)+1,
=x2﹣4x+4,
=(x﹣2)2.