5m^2(a+b)-a-b=5m^2(a+b)-(a+b)=(5m^2-1)(a+b)
(ax+by)^2+(bx-ay)^2=a^2x^2+b^2y^2+2axby+b^x^2+a^2y^2-2axby=a^2x^2+b^2y^2+b^x^2+a^2y^2=a^2(x^2+y^2)+b^2(x^2+y^2)=(a^2+b^2)(x^2+y^2)
5a^2m-15am+3abm-9bm=5am(a-5)+3am(b-3)=(5a-25+3b-9)(a-5)=(5a+3b-34)(a-5)
初中因式分解几道(过程PLEASE) 可以来自网络但是要求准确