1.4²×16-2.2²×4
=(1.4×4+2.2×2)×(1.4×4-2.2×2)
=10×1.2
=12
-ab+2a²b-a³b
=-ab(1-2a+a²)
=-ab(1-a)²=(1.4×4+2.2×2)×(1.4×4-2.2×2)能具体告诉我怎么得出来的吗1.4²×16-2.2²×4=1.4²×4²-2.2²×2²=(1.4×4)²-(2.2×2)²=(1.4×4+2.2×2)×(1.4×4-2.2×2)