<span>
</span><span><span><span><span>
<span><span><span /></span></span><span>1)(1.8+х)*21=71.4
</span><span><span><span><span>((9/5)+x)*21
= 71.4
</span></span><span><span>
9/5+x)*21
= 71.4
</span></span></span></span>
<span><span><span><span>
21*x
= 33.6
</span></span></span></span>
<span><span><span><span>
x =
33.6 / (21)
</span></span></span></span>
<span><span><span><span>
x =
1.6
</span></span></span></span></span></span></span></span>
<span><span><span><span>
<span><span><span><span><span>2)16*(4*x-(17/5)) = 6.08</span></span></span></span></span>
<span><span><span><span>
16*4*x+16*17/5)
= 6.08
</span></span></span></span>
<span><span><span><span>
64*x
= 60.48
</span></span></span></span>
<span><span><span><span>
x =
60.48 / (64)
</span></span></span></span>
<span><span><span><span>
x =
0.945
</span></span><span><span>
<span><span><span><span><span>3)(x-1.25)*(4.5) = 27</span></span></span></span></span>
<span><span><span><span>
(x-1.25)*(9/2)
= 27
</span></span></span></span>
<span><span><span><span>
x-1.259/2
= 27
</span></span></span></span>
<span><span><span><span>
9*x/2
= 32.625
</span></span></span></span>
<span><span><span /></span></span>
<span><span><span><span>
x
= 32.625 / (9/2)
</span><span><span> x = 7.25</span></span></span></span></span>
<span><span><span /></span></span>
<span><span><span><span><span>4)(x+19.64)*0.18
= 144</span></span></span></span></span>
<span><span><span><span>
x*0.18+19.64*0.18
= 144
</span></span></span></span>
<span><span><span><span>
x
= 140.4648 / (0.18)
</span></span></span></span>
<span><span><span><span>
x
= 780.36
</span></span><span><span>
5)
<span>17 (1,6-5x) = 2.38</span>
<span><span><span><span>
17*(8/5-5*x)
= 2.38
</span></span></span></span>
<span><span><span><span>
-85*x
= -24.82
</span></span></span></span>
<span><span><span><span>
Разделим
обе части ур-ния на -85
</span></span></span></span>
<span><span><span><span>
x
= -24.82 / (-85)
</span></span></span></span>
<span><span><span><span>
x
= 0.292
</span></span></span></span><span>6) <span>9,66÷(x+0,17)=23</span></span>
9.66/(х+0.17)=23
9.66=(х+0.17)*23
<span>9.66=23х+3.91, 23х=5.75</span>
x
= 0.25
</span></span></span></span></span></span><span><span>
</span></span></span></span></span></span></span></span>
1-1
2-1,2
3-1,3
6-1,2,3,6
7-1,7
14-1,2,3,4,7,14
21-1,3,7,21
1) 55·6=330
2)807-330=447
3)447:9=53
9×2=18 руб. разница в цене на девяти карандашах.
15-9=6 карандашей можно купить за разницу в цене на девяти карандашах.
18÷6=3 руб стоит простой карандаш.
3+2=5 руб стоит цветной карандаш.
Ответ: 3 руб. простой; 5 руб. цветной.
Если так то:
1) 7472+1173=8645-первые 2 числа в розовой рамочке.
2) 39+24=63-первые 2 числа в жёлтой рамочке.
3) 10+93=103-вторые 2 числа в розовой рамочке.
4) 52+16=68-вторые 2 числа в жёлтой рамочке.
По схеме теперь:
1 3 2
8645*63+68*103=551639
544635 7004
Ответ: 551635.
