假设宽xdm
则长为x+5 dm
体积为长*宽*高=(x+5)*x*8=528
==>8x^2+40x-528=0
==>x^2+5x-66=0
==>(x+11)(x-6)=0
==>x=-11(不合题意,舍去)
x=6
故宽为6 dm
长为11 dm
假设宽xdm
则长为x+5 dm
体积为长*宽*高=(x+5)*x*8=528
==>8x^2+40x-528=0
==>x^2+5x-66=0
==>(x+11)(x-6)=0
==>x=-11(不合题意,舍去)
x=6
故宽为6 dm
长为11 dm