题目内容：

若3k(2k-5)+2k(3/2-3k)=36
k=?

优质解答

6k^2-15k+3k-6k^2=36
则
-12k=36
k=-3

追问：

(-4x-y)(-5x+2y)= (3/4×a的n+1次方-1/2×b）×2ab=