Question

几个初二的提公因式问题= =5①：a-(1/16)a （a的5次方）5②:1/27m -3m2 2③：a -b +a-b

Answer 1

1.a-1/16a^5

=a(1-1/16a^4)

=a(1-1/4a^2)(1+1/4a^2)

=a(1-1/2a)(1+1/2a)(1+1/4a^2)

2.1/27m-3m^5

=3m(1/81-m^4)

=3m(1/9-m^2)(1/9+m^2)

=3m(1/3-m)(1/3+m)(1/9+m^2)

3.a^2-b^2+a-b

=(a-b)(a+b)+a-b

=(a-b)(a+b+1)