х:4=5:25
25х=20
х=20:25
х=0,8
=======================
3/8=15/х
3х=8*15
3х=120
х=120:3
х=40
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х:4=5:25
25х=20
х=20:25
х=0,8
=======================
3/8=15/х
3х=8*15
3х=120
х=120:3
х=40