(1) 15a三次方+10a二次方
=5a²(3a+2)
(2) 12abc—3bc二次方
=3bc(4a-c)
(3) 6p(p+q)—4q(p+q)
=2(p+q)(3p-2q)
(4) m(a—3)+2(3—a)
=m(a—3)-2(a—3)
=(m-2)(a-3)
(1) 15a三次方+10a二次方
=5a²(3a+2)
(2) 12abc—3bc二次方
=3bc(4a-c)
(3) 6p(p+q)—4q(p+q)
=2(p+q)(3p-2q)
(4) m(a—3)+2(3—a)
=m(a—3)-2(a—3)
=(m-2)(a-3)