6: 7/9=6*9/7=54/7=7 5/7
7/9 : 5=7/9*1/5=7/45
13 : 26/29=13*29/26=1*29/2=14 1/2
16: 4/11=16* 11/4=4*11/1=44
9/16 : 6=9/16*1/6=3/16*1/2=3/32
1: 13/18=1*18/13=18/13=1 5/13
1 5/9: 1 8/27=14/9:35/27=14/9*27/35=14/1*3/35=2/1*3/5=6/5=1 1/5
2 10/13: 3 3/26=36/13:81/26=36/13*26/81=36/1*2/81=72/81
3 17/27 : 1 4/45=98/27:49/45=98/27*45/49=2/27*45/1=2/3*5/1=10/3=3 1/3
<span>2 4/7 : 1 1/35 =18/7:36/35=18/7*35/36=1/7*35/2=1/1*5/2=5/2=2 1/2</span>
(0.3-0.2-0.7+0.2)а=-0.4а;
(10-4-6)х+5+х=2х+5
(0.8+0.9)с-(4+3)к=1.7с-1к
-3х+а-4а+х=(-3х+х)+(а-4а)=-2х+(-3а)=-2х-3а
Что тут делать? Это шутка?
2,465=2,5
3,11=3,1
4,15=4,2
8,155=8,16