Question

正方体的棱长10分米,沿水平切成3片每片在切4长条每条在切5块共60个,这60个长方体表面积的和是?

Answer 1

(10/3 * 10/4 + 10/3 * 10/5 + 10/5 * 10/4)*2

=(500+400+300)/60 *2

=40 dm2