Найти х из пропорции 5х+2/9=1/2
5х+2/9=1/2
5х=1/2-2/9
5х=5/18
5х=0,27
х=0,27/5
х=0,055
2(5х+2)=9
10х+4=9
10х=5
х=0,5
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5х+2/9=1/2
5х=1/2-2/9
5х=5/18
5х=0,27
х=0,27/5
х=0,055
2(5х+2)=9
10х+4=9
10х=5
х=0,5