(1)-a^3b^3+2a^2b^2-ab
=-ab[(ab)^2-2ab+1]
=-ab(ab-1)^2
(2)疑似
9(2a-3b)^2-16(a+b)^2
=[3(2a-3b)+4(a+b)][3(2a-3b)-4(a+b)]
=(10a-5b)(2a-13b)
(1)-a^3b^3+2a^2b^2-ab
=-ab[(ab)^2-2ab+1]
=-ab(ab-1)^2
(2)疑似
9(2a-3b)^2-16(a+b)^2
=[3(2a-3b)+4(a+b)][3(2a-3b)-4(a+b)]
=(10a-5b)(2a-13b)