Ответ:
а) 54 – (129–46) = 54-129+46 = -29
б) 28 + (122 – 228) = 28+122-228= -78
в) 23 – (–13+76) = 23+13-76 = -40
а) (44–18) - ( –21–18) = 44–18+21+18
65=65
б) -(–84–13)-( 25–10) = 84+13–25+10
82=82
в) -(65+13)+( –11–115) = –65–13–11–115
-204=-204
а) 25 + (x + 12) = 78
25+х+12=78
37+х=78
х=78-37
х=41
б) 126 –(–134 – a) = 115
126+134+а=115
260+а=115
а= 115-260
а=-145
в) – 405 – (28 + m) = - 267
-405-28-m=-267
-433-m=-267+433
-m=166
m=-166
X-2,8=-1,64
x=-1,64+2,8
x=1,16
ответ x=1,16
5/12+у=-5 3/20
y=-5 3/20-5/12
y=-5 9/60-25/60
y=- 5 34/60
y= - 5 17/30
<span>5(х+3)+7=3(х+12)</span>
<span>5х+15+7=3х+36</span>
<span>5х-3х=36-7-15</span>
<span>2х=14</span>
<span>х=7</span>
<span><span>2(а +2)-10=6(3-а)</span></span>
<span><span>2а+4-10=18-6а</span></span>
<span><span>2а+6а=18-4+10</span></span>
<span><span>8а=24</span></span>
а=3
<span>3(2у-1)+6(3у-4)=83+5(у-3)</span>
<span>6у-3+18у-24=83+5у-15</span>
<span>6у-5у+18у=83-15+3+24</span>
<span>19у=95</span>
<span>у=5</span>
6/54=1/9 - это не натуральное, значит невозможно
1 м 3 = 1000000 см 3
1 м3 = 1000 дм 3