(1)x/5.1=2:17x:5.1=2:17内积=外积 17x=10.2x=102/170=51/85=0.6(2)1.25:0.25=x/1.61.25:0.25=x:1.6内积=外积 0.25x=2x=8
x:5.1=2:17根据内项＊内项=外项乘外项得10.2=17x得x=0.6
