a:b＝x:y
ay＝bxより両辺xyで割ると
a/x＝b/y・・①
b:c＝y:z
bz＝cyより両辺をyzで割ると
b/y＝c/z・・②
①②より
a/x＝b/y＝c/z
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a:b＝x:y
ay＝bxより両辺xyで割ると
a/x＝b/y・・①
b:c＝y:z
bz＝cyより両辺をyzで割ると
b/y＝c/z・・②
①②より
a/x＝b/y＝c/z
Users viewing this question
are also looking at these questions 😉
ありがとうございます