S2S2 and S2S3 10(f) Q6,Q7 Posted by chtanmaths — January 13, 2012 5:16 pm 2 Q8 is the same as Q6, you can simulate the way I do Q6(make 3 zero) and get the result. Like this:LikeBe the first to like this post.
老师，第6题“=（a+b-c)(2bc)-c（-2b)(a+c-b）”里的（2bc）不是应该是（-2bc）吗？
因为
-(b)(-2c)=2bc (positive)