要挖一个梯形的基槽上底39.4米,下底24米,高5米怎样计算坡比
\u7528\u7b80\u4fbf\u65b9\u6cd5\u8ba1\u7b97\uff1a1-5/12+4/15+1/12-14/15-39/20\u89e3\uff1a\u539f\u5f0f=1-5/12+1/12+4/15-14/15-39/20
=1-(5-1)/12-(14-4)/15-39/20
=1-4/12-10/15-39/20
=1-1/3-2/3-39/20
=1-1-39/20
=-39/20
\u89e3\uff1a\u8bbe2004\u5e74\u6b27\u6d32\u4eba\u53e3\u6709X\u4eba\u3002
5X+4=39
5X+4-4=39-4
5X=35
5X\4=35\5
X=7
\u7b54\uff1a2004\u5e74\u6b27\u6d32\u4eba\u53e3\u67097\u4ebf\u4eba\u3002
绛旓細杩欎釜鍧℃瘮=5/((39.4-24)/2))=6/7.7=0.6494