Question

（-4-y）（-5+2y）=______；（4分之3a的n+1次方-2分之1b）×2ab_____

Answer 1

（-4-y）（-5+2y）

=20-8y+5y-2y^2

=20-3y-2y^2

[3/4a^(n+1)-b/2]×2ab

=3/4a^(n+1)×2ab-b/2×2ab

=3/2a^(n+2)b-2ab²

若3k（2k-5）+2k（2分之3-3k）=36,则k=________

3k（2k-5）+2k（3/2-3k）=36

6k²-15k+6k-6k²=36

-9k=36

k=-4