1)690:3=230
2)230*205=47150
3)47150-47150=0
4)0+850=850
5)238145-237776=369
6)369:41=9
7)327:3=109
8)109*7=763
9)9+763=772
10)750:25=30
11)900-30=870
12)870*7=6090
13)120*80=9600
14)10000-9600=400
15)400+6090=6490
1) <span>3,36а-4,44а-13= -1,08а-13;
</span>. <span>2,4b-46+1,7-8b=-5,6b-44,3;
6,5c+30-6,5c-71=-41;
2,7d-7,5-5d+7/5=-2.3d-7.5+7/5;
2)</span><span>-13,7-(-x)=-4,9;
x-13.7=-4.9
x=13.7-</span>4.9
x=8.8<span>
6,1-(-y)= - 5,2;
6.1+y=-5.2
y=-5.2-6.1
y=0.9
-2,9+(-x)=-3,8;
-2.9-x=-3.8
x=-3.8+2.9
x=-0.9
x+(0,35)=2,3;
x=2.3-0.35
x=1.95
-23,5+(-y)=-4,6;
-23.5-y=-4.6
y=-4.6+23.5
y=18.9
y+(-48,3)=-78,5;
y-48.3=-78.5
y=-78.5+48.3
y=</span><span>-30.2
3) </span>1)2,8x-0,6+4,2x+16,8-7x=15.4;
2)13,5y+7-5,2+8,9y-22,4=22.4y<span>-20.6</span>;
3)1,5x-1,8+3,1x-2,9+1,6x=6.2x-4.7;
<span> 4)5y-y+0,8+1,6-3y-y=2.4;</span>
54-4=50
50+5=55
55-4=51
51+5=56
56-4=52
52+5=57
и тп.