帮忙解一道数学题
g*** 2006-02-05 11:17:26 举报
{x -> 2, y -> 2, z -> 3/2}, {x -> 2, y -> 3, z -> 1}, {x -> 4, y -> 1, z -> 3/2}, {x -> 4, y -> 3, z -> 1/2}, {x -> 6, y -> 1, z -> 1}, {x -> 6, y -> 2, z -> 1/2}。
x=2 y=3 z=1
1/5÷2/3=1/5×3/2=3/10小时
(38+41)x2.5=197.5千米
连接OC;∵AB=4,O是AB中点,且△ABC是直角三角形,∴OC=2...