<em>((23,79 : 7,8 - 6,8 : 17) * 3,04 -2,04) * 0,85</em>=<em>((3,05 - 0,4) * 3,04 -2,04) * 0,85=<em>(2,65* 3,04 -2,04) * 0,85=<em>(8,056 -2,04) * 0,85=6,016*0,85=5,1136</em></em></em>
/ дробь
3/9 = 1/3
2/3 нельзя
2/10 = 1/5
15/10 = 3/2
10/11 нельзя
3/24 = 1/8
6/15 = 2/5
8/16 = 2/4 или 1/2
Решение:
1)63:9=7(дней)
Ответ:Вика прочитает книгу за 7 дней!
<span>1)</span>
<span>-5n-16=3n</span>
<span>-5n-3n=16</span>
<span>-8n=16</span>
<span>n=16:(-8)</span>
<span>n=-2</span>
<span>Ответ:-2</span>
<span>2)</span>
<span><span> 8-5n=10-4n</span></span>
<span><span>-5n+4n=10-8</span></span>
<span><span>-1n=2</span></span>
<span><span>n=2:(-1)</span></span>
<span><span>n=-2</span></span>
<span><span>Ответ:-2</span></span>
<span><span>3)</span></span>
9m-8=6m+7
9m-6m=7+8
3m=15
m=15:3
m=5
Ответ:5
4) <span>56-9n=-5n</span>
<span>-9n+5n=-56</span>
<span>-4n=-56</span>
<span>n=-56:(-4)</span>
<span>n=14</span>
<span>Ответ:14</span>
<span>5)</span><span><span>15-8x=2-9x</span></span>
-8х+9х=2-15
1х=-13
х=-13:1
х=-13
Ответ:-13