试题 试卷
题型：填空题 题类：常考题 难易度：普通
4+8+16=16×2﹣4=28
4+8+16+32=32×2﹣4=60
4+8+16+32+64=64×2﹣4=124
4+8+16+32+…+256=
a+2a+4a+8a+16a+…+1024a=
39+27
=39+1+26
=（39+1）+26
=40+26
=66
试题篮
