решите пропорций
1)5\х=8\40
2)12\16=х\4
3)х:15=12:5
4)42:х=18:9
5)0,2:4=х:0.1
6)0,50 : 2=0,4:х
7)8:х=0,4:0,5
8)4 1\2:2=х:8
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