14+х=25
х=25-14
х=11
ответ:11
45-х=12
х=45-12
х=33
ответ:33
(1/4 - 2/3) * (4/5 - 2/15) * (-3/5) = 1/6
1) 1/4 - 2/3 = 3/12 - 8/12 = - 5/12
2) 4/5 - 2/15 = 12/15 - 2/15 = 10/15 = 2/3
3) - 5/12 * 2/3 = - (5*1)/(6*3) = - 5/18
4) - 5/18 * (-3/5) = 3/18 = 1/6
... .................. .......... .
10,12,20,21,23,30,31,32
1)10,12,20,30,32
2)21,23,31