1. (1+3)/3х=4/15 4/3х=4/15 12х=60 х=5 1/15+1/5=4/15
2.1/х-1/7х=2/7 (7-1)/7х=2/7 14х=42 х=3 1/3-1/7=6/21=2/7
3.1/4х+1х=5/16 (1+4)/4х= 5/16 20х=80 х=4 1/16+1/4= 5/16
4. 1/х-1/9х=2/9 (9-1)/9х= 2/9 18х=72 х=4 1/4-1/36= 8/36=2/9
5. 1/8х+1/х=3/8 (1+8)/8х=3/8 24х=72 х=3 1/24+1/3 =9/24=3/8
6, 1/х-1/5х=2/15 (5-1)/5х=2/15 10х=60 х=6 1/6-1/30= 4/30=2/15