若a+b=3则2a²+4ab+2b²-6的值为

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/26 19:34:22
若a+b=3则2a²+4ab+2b²-6的值为若a+b=3则2a²+4ab+2b²-6的值为若a+b=3则2a²+4ab+2b²-6的值为2

若a+b=3则2a²+4ab+2b²-6的值为
若a+b=3则2a²+4ab+2b²-6的值为

若a+b=3则2a²+4ab+2b²-6的值为
2a²+4ab+2b²-6
=2(a²+2ab+b²)-6
=2(a+b)²-6
因为a+b=3
所以
=2X3²-6
=18-6
=12

2a²+4ab+2b²-6
=2(a+b)^2-6
=2*9-6
=12

2a²+4ab+2b²-6
=2(a²+2ab+b²)-6
=2(a+b)²-6
=2*9-6
=12

12