а) 11 1/9 : (2 2/3 + 6 2/9) = 1 1/4 = 1,25.
1) 2 2/3 + 6 2/9 = 2 6/9 + 6 2/9 = 8 8/9
2) 11 1/9 : 8 8/9 = 100/9 : 80/9 = 100/9 · 9/80 = 100/80 = 5/4 = 1 1/4
и
b) 4 3/5 : 5 3/4 + 3,2 - 2 7/8 = 1 1/8 = 1,125
1) 4 3/5 : 5 3/4 = 23/5 : 23/4 = 23/5 · 4/23 = 4/5 = 0,8
2) 0,8 + 3,2 = 4
3) 4 - 2 7/8 = 3 8/8 - 2 7/8 = 1 1/8
Ответ: а) > b), так как 1,25 > 1,125.
1. 11 5/6 - 14 = 71/6 - (14/1 * 6/6) = 71/6 - 84/6 = - 13/6
2. 7 1/3 - 10,6 = 22/3 - 10 6/10 = 22/3 - 106/10 = ( 22*10 - 106*3)/30= (220-318)/30= - 98/30 = - 49/15
3.- 13/6 / 2,6 = - 13/6 / 2 6/10= - 13/6 / 26/10 = - 13/6 * 10/26= - 13/6 * 5/13 = - 1/6 * 5/1 = - 5/6
4. - 49/15 * 2 1/7 = - 49/15 * 15/7 = - 49/1 * 1/7 = - 7/1 * 1/1 = - 7/1
5. - 7/1 / 13 = 7/1 / 13/1 = 7/1 * 1/13 = 7/13
6. 7/13 / 2,6 = 7/13 / 26/10 = 7/13 * 10/26 = 7/13 * 5/13 = 35/169
7. - 5/6 + 35/ 169 = (-845 + 210)/1014= -635/1014
8. - 635/1014 + 12 5/6 = - 635/ (6*169) + 77/6= (-635+13013)/1014= 12378/1014= 2063/169= 12 35/169
Ответ. 12 35/169
1) х=16/4
х=4
2)3х=13+2
3х=15
х=15:3
х=5
3) 3х+2=20
3х=20-2
3х=18
х=18:3
х=6
4) 3х-2х=12
1х=12
х=12:1
х=12
5)5х-2х=7+2
3х=9
х=9:3
х=3
6) 3х-4х=6+2
-1х=8
х=8:-1
х=-8
7)6х-4х=-2-6
2х=-8
х=-8:2
х=-4
8)-2х-2х=8+4
-4х=12
х=12:-4
х=-3