а)14/15-11/12 = -1\60
б)18*2 5/6 = 18 * 17\6 = 3*17=51
в)(3/4+2,4):9/11= (3\4+12\5)*11\9=63\20 * 11\9 = 3,85
5(4-7х)+1=34-9х
20-35х+1=34-9х
-26х=13
х=-0,5
1. а) 56/60-55/60=1/60
б) 18*2 5/6=18/1*17/6=51
в) (15/20+48/20):9/11=63/20:9/11=3,85
2. 5(4-7х)+1=34-9х
-35х+9х=34-20
-26х=14
х=14:(-26)
х= -14/26
х=-7/13
а)14/15-11/12 = -1\60
б)18*2 5/6 = 18 * 17\6 = 3*17=51
в)(3/4+2,4):9/11= (3\4+12\5)*11\9=63\20 * 11\9 = 3,85
5(4-7х)+1=34-9х
20-35х+1=34-9х
-26х=13
х=-0,5
1. а) 56/60-55/60=1/60
б) 18*2 5/6=18/1*17/6=51
в) (15/20+48/20):9/11=63/20:9/11=3,85
2. 5(4-7х)+1=34-9х
20-35х+1=34-9х
-35х+9х=34-20
-26х=14
х=14:(-26)
х= -14/26
х=-7/13