1.(20X8+20x10+10x8)x2
=(160+200+80)x2
=(360+80)x2
=440x2
=880dm2
答:至少需要880平方米的玻璃。
2.20x8x4
=160x4
=640dm3
640*(8x10)
=640*80
=8dm
答:则水深8分米。