1.4:28=2:40 1.4:2=28:40 28:1.4=40:228:40=1.4:22:1.4=40:282:40=1.4:2840:2=28:1.440:28=2:1.4
①1.4:28＝2:40②28:1.4＝40:2③1.8:2＝28:40④2:1.8＝40:28⑤2:40＝1.4:28⑥40:2＝28:1.4⑦28:40＝1.8:2⑧40:28＝2:1.8
