A:What's your jacket?
B:What color is your jacket?
C:Is it a jacket
D:What's this in English?
化简a2+4a+4a2-4÷( a2a-2+ 2aa-2)的结果是( )
一个圆柱的侧面展开是一个边长31.4厘米的正方形,这个圆柱的底面半径是____厘米。
请你回答: