2х-(1+9х)=20
2х-1-9х=20
-7х=20+1
-7х=21
х=21:(-7)
х=-3
3х-15,6=0
3х=15,6
х=15,6:3
х=5,2
8х+2=3х-18
8х-3х=-18-2
5х=-20
х=-20:5
х=-4
1) 6-4 = на 4 см больше одна сторона,чем другая
8
___
1850, 0,8/185*100%=,043%
2) 12/185, 12/185*100=6,49%
3)6/185, 3,24%
4) 4/185, 2,16%
5) 8с/185
64^(1/12) * 64^(1/4) = 64^(1/12) * 64^(3/12) = 64^(4/12) = 64^(1/3) = 2^(6/3) = 2^2 = 4;
57.4:4+1 1/6:4 2/3-(2.7+5 1/20)*0.8/2 1/5-(1 2/3+1/5)=
<span>14,35+7/6:14/3-(2.7+5,05)*0.8/ 11/5-(1 10/15+3/15)=</span><span>
14,35+7/6*3/14-7,75*0.8*5/11-1 13/15=
</span>14,35+7/2*1/14-31/11-1 13/15=
14,35+1/2*1/2-2 9/11-1 13/15=<span>
14,35+1/4-2 135/165-1 143/165=
</span>14,35+0,25-3 278/165=14,6-4 113/165=
=10,6-113/165=10 6/10-113/165=10 3/5<span>-113/165=10 99/165-113/165=10-14/165
=9 151/165
</span>