выразите отношение a к b из пропорции:
a)a:7=b:2
b)(a-b):b=2:5
1)a/7=b/2
2a=7b
a/b=7/2
2) (a-b)/b=2/5
5a-5b=2b
5a=7b
a/b=7/5
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1)a/7=b/2
2a=7b
a/b=7/2
2) (a-b)/b=2/5
5a-5b=2b
5a=7b
a/b=7/5