Решите пожалуйста дам 45...

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Решите пожалуйста дам 45...


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Алгебра (38 баллов) | 30 просмотров
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Правильный ответ

365.
х/3+х/12=15/4
(4х+х)/12=15/4
5х=15/4 ×12
5х=45
х=45÷5=9
$$$$$$$$
366.
х/4 + х/8=3/2
(2х+х)/8=3/2
3х/8=3/2
3х=3/2×8
3х=12
х=12÷3=4
$$$$$$$$$$
367.
х/5 - х/2=-3
(2х-5х)/10=-3
-3х=-3×10
-3х=-30
х=-30÷(-3)
х=10
$$$$$$$$$$$
368.
х/4 - х/3=-1
(3х-4х)/12=-1
-х=-12
х=12
$$$$$$$$$$
369.
(х+9)/3 -х/5=1
(5(х+9)-3х)/15=1
5х+45-3х=15
2х=15-45
2х=-30
х=-30÷2=-15
$$$$$$$$$$$
370.
(х-6)/4 -х/3=1
(3(х-6)-4х)/12=1
3х-18-4х=12
-х=12+18
х=-30
$$$$$$$$$$
371.
(х-4)/3+х/2=5
(2(х-4)+3х)/6=5
2х-8+3х=5×6
5х=30+8
5х=38
х=38÷5=7.6
$$$$////
х/3 + (х-1)/2=4
(2х+3(х-1))/6=4
2х+3х-3=24
5х=24+3
5х=27
х=27÷5=4.8
$$$$$$$
(х-1)/2=(4+2х)/3
3(х-1)=2(4+2х)
3х-3=8+4х
3х-4х=8+3
-х=11
х=-11
$$$$$$$$$$
(3х-2)/5=(2+х)/3
3(3х-2)=5×(2+х)
9х-6=10+5х
9х-5х=10+6
4х=16
х=16÷4=4
$$$$$$$$$$
(х-4)/4 - 2=х/2
(х-4-4)/4=х/2
х/4=х/2
х/2=х
х=2х
х=0
$$$$$$$$$
(х+7)/6 +2=х/3
(х+7+6)/6=х/3
(х+13)/2=х
х+13=2х
13=2х-х
х=13
$$$$$$$$$
(х+9)/3 -(х-1)/5=2
(5(х+9)-3(х-1))/15=2
5х+45-3х+3=15×2
2х+48=30
2х=30-48
2х=-18
х=-18÷2=-9
$$$$$$$$$$
(х-4)/2 -(х-1)/5=3
(5(х-4)-2(х-1))/10=3
5х-20-2х+2=3×10
3х-18=30
3х=30+18
3х=48
х=48÷3=16
$$$$$$$$/$$
(х+1)/2 -5х/12=3/4
(6(х+1)-5х)/12=3/4
6х+6-5х=3/4 ×12
х+6=9
х=9-6=3
$$$$$$$$$$$
(2х+1)/2 -3/4=7х/8
(2х+1)/2- 7х/8=3/4
(4×(2х+1)-7х)/8=3/4
8х+4-7х=3/4 ×8
х+4=6
х=6-4=2
$$$$$$$$$$$
1/3 (4х+2)=2х-1
4х+2=3(2х-1)
4х+2=6х-3
2+3=6х-4х
2х=5
х=5÷2=2.5
$$$$$$$$$$
2х-12=1/4 (3х+2)
4(2х-12)=(3х+2)
7х-48-3х=2
4х=2+48
4х=50
х=50÷4=12.5
$$$$$$$$$$$
1/2 (5х+2)=7/2(х-6)
5х+2=7(х-6)
5х+2=7х-42
2+42=7х-5х
2х=44
х=44÷2=22
$$$$$$$
4/3 (х-8)=1/3 (6х-4)
4(х-8)=2(3х-2)
2(х-8)=3х-2
2х-16=3х-2
2х-3х=-2+16
-х=14
х=-14
$$$$$$$$$$$

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спасибо большое!!