7 3/10+ 25/28 х =8 13/35 25/28 х = 293/35-73/10 25/28 х = 293/35-73/10 25/28 х = (586-511)/70 25/28 х = 75/70 х = (75*28)/(70*25) х = 6/5 = 1 1/5 = 1,2
3 1\3 - 1 1/20 х = 1 14/15 -21/20 х = 29/15-10/3 -21/20 х = (29-50)/15 21/20 х = 21/15 х = (21*20)/(15*21) = 4/3 = 1 1/3
3/8 х + 7/12 х - 5/6 х = 9/32 ((3*3+7*2-5*4)/24) х = 9/32 3/24 х = 9/32 1/8 х = 9/32 х = 9/32 : 1/8 х = (9*8)/(32*1) = 9/4 = 2 1/4 = 2,25
2 1\3 : х - 1 1/6 = 1 5/9 7/3 :х = 14/9 + 7/6 7/3 : х = (28+21)/18 7/3 : х = 49/18 х = 7/3 : 49/18 = (7*18)/(3*49) = 7/7
2 1/3 :( х - 1 1/6) = 1 5/9 7/3 : х - 7/3 : 7/6 = 14/9 7/3 : х - 2 = 14/9 7/3 : х = (14+18)/9 х = 7/3 : 32/9 = (7*9)/(3*32) = 21/32
7х-3х-2х=х+9
2х=х+9
2х-х=9
х=9
2) 13-(2х-5)=х-3
13-2х+5=х-3
-2х-х=-3-13-5
-3х=-21
х=7
3) 3х-(10-9х)=22х
3х-10+9х=22х
12х-10=22х
22х-12х=-10
10х=-10
х=-1
4) 26-(17-2х)=5х
26-17+2х=5х
5х-2х=9
3х=9
х=3