Решите уравнение
1)(20-а)-6 7/18=3 17/18
2) 1,2-(х-1/4)=1/2
3) 12-(х+4 7/15)=5 13/15
1)(20-а)-6 7/18=3 17/18
2) 1,2-(х-1/4)=1/2
3) 12-(х+4 7/15)=5 13/15
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20-а=3 17/18+6 7/1820-а=9 24/18
20-а=10 6/18
20-а=10 1/3
а=20-10 1/3
а=19 3/3-10 1/3
а=9 2/3
х-1/4=1 2/10-1/2
х-1/4=1 2/10-5/10
х-1/4=12/10-5/10
х-1/4=7/10
х=7/10+1/4
х=14/20+5/20
х=19/20 или если у вас опечатка в этом примере то
х-1/4=1/2-1/2
х-1/4=0
х=1/4
х+4 7/15=12-5 13/15
х+4 7/15=11 15/15-5 13/15
х+4 7/15=6 2/15
х=6 2/15-4 7/15
х= 5 17/15-4 7/15
х=1 10/15
х= 1 2/3