-4a²b²+12ab-9
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 11:38:46
![-4a²b²+12ab-9](/uploads/image/z/2708874-18-4.jpg?t=-4a%26%23178%3Bb%26%23178%3B%2B12ab-9)
x)5ITS64NPچFI6IE8l U}0= ㆉ0ep6yvP79xm@Xe }' ab
-4a²b²+12ab-9
-4a²b²+12ab-9
-4a²b²+12ab-9
-4a²b²+12ab-9
= -【(2ab)²-12ab+3²】
= -(2ab-3)²
-4a²b²+12ab-9
=-(4a²b²-12ab+9)
=-(2ab-3)²
原式=-(4a²b²-12ab+9)
=-(2ab-3)²