因式分解x2-9y2的正确结果是( )A.(x+9y)(x-9y) B.(x+3y)(x-3y) C.(x...
问题详情:因式分解x2-9y2的正确结果是( )A.(x+9y)(x-9y) B.(x+3y)(x-3y) C.(x-3y)2 D.(x-9y)2【回答】B 知识点:因式分解题型:选择题...
问题详情:因式分解x2-9y2的正确结果是( )A.(x+9y)(x-9y) B.(x+3y)(x-3y) C.(x-3y)2 D.(x-9y)2【回答】B 知识点:因式分解题型:选择题...