【計(jì)算題】排球競(jìng)賽規(guī)規(guī)定：發(fā)球方贏球時(shí)得分，輸球時(shí)則被對(duì)方奪得發(fā)球權(quán)。甲、乙兩個(gè)排球隊(duì)進(jìn)行比賽，已知當(dāng)甲隊(duì)發(fā)球時(shí)，甲隊(duì)贏球和輸球的概率分別是0.4和0.6；當(dāng)乙隊(duì)發(fā)球時(shí)，甲隊(duì)贏球和輸球的概率都是0.5，無論哪個(gè)隊(duì)先發(fā)球，比賽進(jìn)行到任一隊(duì)得分時(shí)為止，求當(dāng)甲隊(duì)發(fā)球時(shí)各隊(duì)得分的率。