А) 2,1х=Х+0,2+0,9
<span>б) Х+0,2+2,1х+2,1х+х=5,84 </span>
<span>в) х+0,2+0,9+2,2=2,1х </span>
18144 /42
-168 432
-------
134
- 126
---------
84
-84
------
0
4760 /28
-28 170
-----
196
-196
------
00
2)320+4=324 1)4•5=20 3)3•9=27 4)3+27=30 5)22+18=40 6)40:8=5
7+123=130
DBE=5<span>0º-30%=35<span>º</span></span>
<span><span>5<span>0º-40%</span></span></span>
х-100%
х=50*100:40=125<span>º ABC</span>
ABD=125<span>º-5<span>0º-35<span>º=4<span>0º</span></span></span></span>